Selena Gomez's embarassing 20th birthday moment at the Teen Choice Awards

Selena Gomez was quite the lucky lady as she celebrated her 20th birthday with boyfriend Justin Bieber, gal pals Demi Lovato and Taylor Swift, and hundreds of adoring fans and fellow celebrities at the 2012 Teen Choice Awards held at the Gibson Amphitheatre in Universal City, California on Sunday.The brunette pop star accepted the surfboard trophy for Choice Music Group for her band, Selena Gomez and the Scene, saying it was the best birthday present ever. Kevin Hart ("Think Like a Man"), who presented Gomez with the award alongside "The Vampire Diaries" star Nina Dobrev, ushered everyone to sing to her despite her "Oh, no!" pleas. The former "Wizards of Waverly Place" actress was then surprised with sparkler-topped Sprinkles cupcakes as the entire crowd inside the theater (and we're sure viewers at home, too!), including Swift and "iCarly's" Miranda Cosgrove, belted out "Happy Birthday!" At one point during the serenade, Gomez buried her face in her hands, clearly embarrassed but happy. The "Love You Like a Love Song" singer tried to blow out the sparklers afterwards, but Hart signaled for her not to, so she wheeled the treats off the stage and headed back to her front row seat next to Bieber. Too bad he never came on stage to give her a birthday kiss!