Some 35,000 gathered on the White House South Lawn Monday morning for the 137th annual Easter Egg Roll festivities. Pop band Fifth Harmony and duo MKTO brought music to the event, and Mrs Obama joined the So You Think You Can Dance All Stars on stage taking the spotlight during a choreographed routine. This comes only days after she sported her mom dance moves on the Tonight Show Starring Jimmy Fallon during a segment called The Evolution of Mom Dancing Part 2. On Monday, another highlight of the day's festivities was Mr Obama's annual reading of his favorite childhood book Where the Wild Things Are, which he has done since 2009. However, this year there was a disturbance when bees started buzzing near the children gathered for story-time on the South Lawn. Not breaking character, Mr Obama settled the shrieking children by saying: 'If you're a wild thing, you can't be scared of bees!' Moves: The First Lady busts out her best dance moves to join the So You Think You Can Dance All Stars on stage at the Easter Egg Roll . Style: The First Lady took the spotlight during the performance as she added her own flair to the choreographed routine . Uptown Funk: Mrs Obama displays her moves during the routine, only days after she joined Jimmy Fallon on the Tonight Show where she danced in a segment called the Evolution of Mom Dancing Part 2 . GimmeFive: The theme of this year's Easter Egg Roll is 'GimmeFive' which is part of the First Lady's campaign to get people to be more active . This year's theme is #GimmeFive, which is part of Mrs. Obama's campaign to try to get young people to be more active and lead healthier lives. However, President Obama did confess to having a bit of not-so-healthy Easter chocolate when asked by a reporter at the event. 'I had a few, I have to admit,' Mr Obama said. Notably not in attendance were first daughters Sasha, 13, and Malia, 16, Obama. The president said they were occupied by 'a little school stuff going on'. Grrrrr: President Obama reads from the children's classic Where the Wild Things Are during Monday's Easter egg roll on the White House South Lawn . 'Let the wild rumpus start!': Each year, the president reads the book which was a childhood favorite . Be brave: At one point, bees were bothering some of the children gathered to hear the president read, and he refused to break character, saying 'If you're a wild thing, you can't be scared of bees! What a crowd: An estimated 35,000 came to the White House South Lawn Monday for the annual Easter egg roll . Celebrating spring: Above, the scene on the White House's South Lawn Monday morning as the Easter egg roll kicked off . Monday's events included sports and fitness zones, cooking demonstrations, and of course, the traditional egg roll in which kids compete to move their egg to the finish line first using only a wooden spoon. Staying true to the roll's theme, the president kept active during the event, playing tennis with Danish racket star Caroline Wozniacki and basketball with members of the Washington Wizards. Despite all the pick-up games he stages on the South Lawn courts, Mr Obama appears not to have improved his game much since he was hit in the head while shooting hoops Monday. Let the good times roll: President Barack Obama opens the annual White House Easter Egg Roll on Monday morning . Getting the party started: Mrs Obama (center) checks out the crowd of 35,000 as her husband and the Easter Bunny wave . White House tradition: The president looks anxious to get the roll started on Monday, standing next to the Easter Bunny . Bo and Sunny along for the fun: The President and Mrs Obama walk down to the south Lawn with the family dogs Bo and Sunny for the Easter fun . Bunny-in-chief: The Easter Bunny photobombs a serious President Obama in this shot from Monday's Easter egg roll . According to a USA Today reporter, 'a ball very lightly hit POTUS in the face when he was standing under the basket catching rebounds, and Wizards' Paul Pierce seemed to apologize for that.' A Malayan flying fox named Kamilah, was also brought in to teach the children about bats and their ecosystems. For this year's celebrations, the White House collaborated with Snapchat and asked attendees to send out pictures on the social media app so that people around the world can follow along. It's a race! President Obama and the first lady watch as young boys and girls participate in the Easter egg roll . And they're off! Mr Obama blows a whistle to signal the start of the Easter egg roll where children compete to move an egg down a course the fastest using only a wooden spoon . The egg roll is one of the longest-standing White House traditions. In 1878, a sympathetic President Rutherford B. Hayes opened the White House grounds to local children for egg rolling when lawmakers passed a law banning the game from Capitol grounds. The Easter egg roll is free and tickets are distributed via a lottery to families with children 12 and under. Good game: President Obama shakes the hand of a young participant in the Easter Egg roll on Monday . Tender moment: President Obama greets a young guest during the White House Easter Egg Roll on the South Lawn of the White House on Monday . Hoops: President Obama stands with Bilqis Abdul-Qaadir, a female Muslim American collegiate basketball player for the University of Memphis, after both played on basketball court at Monday's Easter egg roll . Swoosh: President Obama shrugs after shooting a basket during Monday's pick-up game on the White House South Lawn . Easter tunes: The members of the girl group Fifth Harmony serenade the crowd from the White House on Monday . However, one of the children in attendance Monday was invited by President Obama himself. A 9-year-old girl named Sofia, from Massachusetts, made headlines last year when she sent a letter to the president, asking him why there weren't any women on U.S. currency. The president responded to the adorable letter and told little Sofia she had a great idea and had come up with a list of outstanding women. Each president has put his own spin on the event, such as President Jimmy Carter who added a petting zoo in 1977. Dressed to the nines: A little girl in her best Easter wear rolls a blue egg with a wooden spoon at Monday's festivities . Taking part in the tradition: The Easter egg roll is one of the White House's long-standing traditions, dating back to President Rutherford B Hayes' administration in 1878 . Competitive: The theme of this year's event was Let's Move, so it was only appropriate that the president break a sweat with tennis star Caroline Wozniacki . Sportsmanship: Wozniacki and the president exchange a friendly high five after their game of tennis on Monday . Strong backhand: The president stuck to the baseline and kept his eye on the ball during the rally . Good play: President Obama reacts with surprise after scoring a point against the Danish tennis star . Oh say can they sing! The iD4GIRLS perform the national anthem at the beginning of the Easter egg roll on Monday . Happy family: While first the president's daughter's Malia (left) and Sasha (right) were no where to be seen at the Easter egg roll on Monday, they did pose for an Easter portrait with their parents on Sunday .
President Obama kicked off festivities for annual event Monday morning .
Mrs Obama joined So You Think You Can Dance All Stars for routine .
White House expected 35,000 to attend the annual tradition .
The Easter egg roll dates back to 1878, during Rutherford B Hayes' administration .