The parents who spent £250,000 on a teenage birthday party: Rap stars. Circus acts. A frock jetted in from Texas. Krug on tap. And a VERY extravagant night at an Essex mansion Birthday girls: Ellie Pearman (left) and step-sister Francesca Robertson (right) pose with rapper Professor Green at their 18th birthday party Caked in make-up and wearing expensive, sparkling designer dresses, the two teenagers looked every bit like the B-list celebrities who squawk estuary English on The Only Way Is Essex. But instead of being on a reality TV show, step-sisters Ellie Pearman and Francesca Robertson were starring in their very own garish 18th birthday party celebrations. It was, according to Steven Duggan, party organiser to stars such as Simon Cowell and Elton John, one of the most extravagant events he had ever seen. With fire-breathing Cirque du Soleil acrobats, a huge £60,000 marquee, four DJs and rappers, four separate dance-floors and bars, and a 15-minute firework display, the entire bash cost more than £250,000. With such a price tag, it surely makes it one of the most expensive teenage parties Britain has ever witnessed. The couple who chose to lavish such a vast sum - nearly ten times the national average annual salary - on their daughters are Essex multi- millionaires Bryn and Sarah Robertson, both 47. They threw the excessive coming-of-age party last month. Francesca is Mr Robertson's daughter from a previous marriage, while Ellie is his wife's daughter from an earlier relationship. Mr Robertson made his fortune selling imported British goods to bars and restaurants on Tenerife. But the family's eight-bedroom Georgian mansion in Essex - bought for £4 million in 2009 - is a world away from the warehouse on a small industrial estate in Las Chafiras, one of Tenerife's least glamorous enclaves, where Mr Robertson began trading in the Nineties. He now runs a chain of supermarkets in Spain. Guests were treated to canapes, sweets, birthday cake and on-tap Krug champagne and cocktails at the party, which took place in Essex The four different marquees each had a different theme, including an Alice In Wonderland room for the cake and an Ibiza nightclub The lavish Saturday-night party for the girls, who admit they were "spoilt" rotten by the occasion, was held in the sprawling grounds of the family home. For more than a month, a dedicated team of four party planners from Steven Duggan Events worked on the bash. And tickets - or rather wristbands - to go to the party became highly prized among the local teenagers. Ellie and Francesca were asked by Duggan's team to draw up a wish list of rap artists and DJs they wanted to perform. The girls also chose the theme - Ibiza Club Scene - and decided on Krug champagne as their tipple of choice. The family mansion in Essex where party planners worked for months ahead of the event, which included four marquees Steven Duggan, who has been planning events for some of the UK's top stars, said the party left guests speechless Tacky cocktails with names such as Porn Star Martini and Sex On The Beach were also laid on. The girls plumped for the rap star Professor Green - who recently married Made In Chelsea star Millie Mackintosh - and another rapper called Chipmunk, as well as DJs Ironik and Scorcher. All of these performers command five-figure appearance fees. The main marquee had three "wings" and cost a staggering £60,000. Cirque de Soleil acrobats appeared at the event, which set the girls' parents back around £250,000 As preparations for the party got underway, teenagers in the nearby towns talked of little else. The celebrations would be the party of the decade. About a week beforehand, college and university students began using social networking sites to boast that they had received a coveted invitation and wristband pass in the post. Ellie and Francesca, meanwhile, had been making regular trips to London to be fitted for their American prom-style dresses. Ellie picked a lavish Sherri Hill dress that her parents had sent over from Texas. The dress designer has made clothes for the Miss America, Miss USA, Miss Universe and Miss China beauty pageants. And now, she can boast of having designed a dress for Miss Essex. "Sooooo in love with my party dress," Ellie tweeted after it arrived. But she did not want her friends to be left out on the glamour stakes and so tweeted the best place to get a one-hour, all-over spray tan for the event. One friend of the step-sisters could barely contain herself after discovering which DJs and rappers had been booked for the September 14 party. But the news that Krug and cocktails would be flowing freely was particularly attractive. She posted a picture of a girl being sick into a toilet on Twitter, adding: "This will be me on Sunday morning." Ellie replied: "Can't wait woooo!!! I'm going to make sure I get you more drunk than me. On the big night, the Robertson mansion was, according to one local, "lit up like a beacon." The nearest neighbours, elderly residents at a care home, had received a visit warning them hundreds of teenagers would be descending on the area. One woman, who asked not to be named, said: "Someone called round - I am not sure if it was the mum - and just said there would be a party and hoped that the noise would not cause any problems." In the sweets and alcoholic drinks area guests were required to show proof of age before being served Porn Star Martinis and Sex On The Beach cocktails, a representative from the events company insisted The girls' friends and family had their own VIP area of white couches and drapes, where their personal supply of champagne was stored and guarded by bouncers From 8pm, the repetitive booming beat of dance music from the huge marquee summoned more than 400 teenagers to the party. The boys wore jeans and smart shirts, and a few had even donned suits. The girls, meanwhile, were heavily made up and wearing expensive party dresses. All of them were clamouring to get a glimpse of the rappers and DJs. After flashing their wristbands at the burly security guards patrolling the perimeter fence, the guests were ferried to the main marquee on golf buggies. There, they were greeted by fire-breathing acrobats from the famous Cirque du Soleil show, while models handed out flutes of champagne and cocktails. Three different "zones" had been set up. The first was a sweets and alcoholic drinks area ("Guests had to show proof of age," a PR for the events company insisted). Then there was a food area - essential to soak up the alcohol. Waiters offered canapes, including Mexican nibbles, mini servings of fish and chips, scallops and Chinese dim sum. Then there was the vast Alice In Wonderland birthday cake given a zone all of its own. Duggan, who says he is asked to create up to four such extravagant teen parties a year, later said: "We had more than 90 props of all different shapes and sizes in the marquee, from giant carousel horses to lollipops, large Venetian masks and chocolate fountain tables that offered 40 different types of sweets." The main attraction was the Ibiza-themed marquee with four separate dance-floors, each with its own bar. Inside was the main stage, where the rappers and DJs performed beneath huge lighting rigs. The girls, their parents and other members of the family had their very own VIP area consisting of a circular area with white Only Way Is Essex-style seating, white cushions and flowing white drapes. Their own supply of Krug champagne stood in a white ice bucket. From there, the birthday girls had a perfect view of the main stage. The cordoned-off VIP area was policed by yet more security guards, ensuring hoi polloi were kept at bay. Star DJ's who command up to five figures for an appearance performed on the main stage in the Ibiza-themed club room Party organiser Steve Duggan is pictured with celebrities Chipmunk and Professor Green, who performed at the party at the girls' request During the party, Ellie found time to tweet: "Having the best night at my bday party," just in case anyone was worried the party was not living up to her expectations. "I know I'm a spoilt one," she added. At about 11pm, the sisters took to the stage and everyone was asked to give a rousing rendition of Happy Birthday. Afterwards, everyone flocked outside for a 15-minute firework display. One female partygoer, who did not want to be named, says: "It was like a scene from Disney. The music was blaring throughout. There was no trouble. Everyone was in a good mood, having been blown away by the sheer spectacle of the event. The two girls were over the moon. Long after midnight, at around 3am, taxis began arriving to ferry the guests home. One local resident said: "There was one hell of a party going on - we could hear the noise all evening. There were marquees up on the grass and there were a lot of people milling about. But there certainly weren't any louts rolling around in the bushes as you might expect with parties involving teenagers. Nevertheless, there were plenty of sore heads next day. Ellie's friends posted messages on social media sites saying they were so hungover they could not be roused from their beds. One reveller said on Twitter: "Just feel rough, proper feeling it today." Ellie, however, was a little disgruntled the party had come to an end. I'm so depressed. I wanna do it all over again! Had the best night," she tweeted. Fire eaters and acrobats were among the hoards of entertainment laid on by the girls, who tweeted their excitement throughout the party A night to remember: After the adrenaline-rush of the party, which attracted hundreds of teenagers to the house, the girls were left 'depressed' and 'bored' Her friend who had wanted to drink until she was sick, had, it appears, fulfilled her ambition. FML [F*** My Life] I've just woken up feeling sick. What have yous [sic] done to me. Please don't tell me this is a two-day hangover. Ellie replied: "Might as well through [sic] another party. Got enough drink. One friend was so impressed with the Robertsons" home, they tweeted: "When I saw your house I nearly wet myself." Within a few days, however, Ellie, who announced that she had "fallen in love" with the rapper Professor Green, was beginning to find life a little dull again after what she described as "the bestest [sic] night." "So bored," she tweeted, which rather makes you wonder if those hundreds of thousands of pounds were worth it after all. Ellie later posted tweets boasting of how pictures of some of the attractions at her party had appeared on MailOnline under a headline explaining that the party had cost £250,000. She said: "Feel privileged." Later on, however, some friends pointed out how comments on the website suggested the beneficiaries of the "tasteless party" were spoilt. Responding on Twitter to the comments, Francesca said: "Funny, ain't they." To which Ellie tweeted: "I don't like being called a spoilt brat. Oh well.