She's one of the most glamorous royals on the planet and last night was no exception for Spain's Queen Letizia of Spain. Resplendent in a backless sequinned dress, the 42-year-old's slender frame was clearly visible and a sharply defined set of muscles on show. The royal. who was making an appearance at the Woman Awards held at Madrid Casino, also used the occasion to début a sharp new bob haircut. Scroll down for video . Defined: Spain's Queen Letizia showed off a noticeably defined back during an appearance in Madrid . Backless: Her low cut cocktail dress showed off every bone and muscle in her back . Short cut: The 42-year-old mother-of-two also unveiled a glamorous new bob hair cut . Got the chop: Spain's Queen Letizia arrives at Madrid Casino for the Woman Awards Ceremony . Elegant: The royal accessorised her sequinned black gown with an enormous pair of chandelier earrings . With her was actress Salma Hayek, 48, who was there to receive an award and looked cheerful in a bright red off-the-shoulder ensemble. After presenting Mexican Ms Hayek with her prize, Letizia, who is recently returned from Copenhagen, posed for photos alongside some of the other winners. Among them were conductor Inma Shara and doctor Maria Neira, while watching from the audience was communication company Grupo Zeta's president Antonio Mosbah. For all the star power on show though, all eyes were on Letizia who looked relaxed and happy as she chatted to Ms Hayek. The 48-year-old star, who brought her seven-year-old daughter Valentina to the ceremony, was taking a break from her preparations for next month's Cannes Film Festival. Ms Hayek stars in Tale of Tales, a dark Matteo Garrone fantasy based on a collection of 17th century Italian folk stories, which is set to make its début at the event on 14th May. Glitzy: The event, which was held at Madrid Casino, attracted some of Spain's biggest names . Warm welcome: Letizia, who is recently returned from Copenhagen, got a warm welcome from the crowd . Speaking out: Letizia made a speech during last night's award show . Presenting the prizes: Letizia also presented Mexican actress Salma Hayek, 48, with an award . Mwah! The pair looked happy to be in each others' company as they exchanged kisses on stage . She has also been taking on increasing amounts of charity work and, two years ago, founded Chime for Change - an organisation currently funding health and education projects worldwide. Current projects include building homes for Syrian refugees living in Lebanon and Turkey as well as others that focus on female empowerment. Ms Hayek's charitable interests overlap with those of Queen Letizia, who has used her first year on the throne to champion children's causes and the arts. The royal, who spent much of last week in Copenhagen where she took part in Queen Margrethe II's birthday celebrations, has also helped highlight the plight of people suffering from rare illnesses. To that end, the former journalist last week delivered a speech at the CosmoCaixa Science Museum during the opening day of the Second Congress of Uncommon Diseases. Round of applause: Letizia and Ms Hayek have both championed women and children's rights . And smile! Letizia poses for photos along with Grupo Zeta's president Antonio Mosbah (right) and Ms Hayek . Mummy's girl: Ms Hayek brought her seven-year-old daughter Valentina with her to the show . Spain's got talent: Ms Hayek with Inma Shara, Queen Letizia, Maria Neira and Mr Mosbah . Earlier this month, Queen Letizia (left) and her husband King Felipe (right) celebrated Queen Margrethe of Denmark's 75th birthday at a dinner ball held at Christiansborg Palace in Copenhagen . The day before, she sported a white trouser suit with a blush-coloured silk top to visit the CosmoCaixa science museum .
The Spanish royal made a speech at the Woman Awards in Madrid .
She presented Mexican actress Salma Hayek with an award .
Letizia was glamorous in a sequinned dress and showed off a bob .
Backless dress revealed a set of sharply defined back muscles .
Ms Hayek, 48, brought her seven-year-old daughter Valentina along .