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18 April 2012, 12:41 | Updated: 18 April 2012, 12:46
The N-Dubz star arrived incognito for the bash in celebration of her celebrity representative.
Tulisa Contostavlos was seen arriving for a birthday party in London last night (17th April) wearing a mask of her agent Jonathan Shalit.
The 'Young' singer posed for shots with the disguise before heading inside to celebrate the 50th birthday of her representative.
The X Factor judge was also sporting a revealing long black dress and stylish heels as she arrived alongside her close friend Gareth Varey.
Other celebrities who attended the event included Kelly Brook, Myleene Klass, and Sugababes star Jade Ewen.
You can view a picture of Tulisa arriving at Jonathan Shalit's birthday party below: (Picture: Goff)
Meanwhile, Tulisa recently confirmed to Capital that she would be making a return to the X Factor for a second series and spoke out about working with her former boyfriend and ex-bandmate Fazer saying they would make a "smash".