Not Only Can She Act, But Mischa Sings Too!

Mischa recently gave an impromptu performance of Britney Spears' hit song "Oops!... I Did It Again" at a London nightclub. The former "O.C." actress was enjoying an evening out on Tuesday when she decided to treat revelers at the trendy Paper nightclub to some of her singing.

The 20-year-old jumped on stage and launched into the famous song, and even treated clubbers to a sexy dance routine.One onlooker said, "She got on stage clutching a microphone and a bottle of champagne. She seemed a bit drunk, but her singing was good. She certainly can hold a note." Mischa isn't the only young star who has been enjoying London's nightlife this week. Christina Aguilera racked up an astounding $2,600 bar bill while partying on Tuesday night. The pop singer wasted no time getting into the party spirit at Kabarets Prophecy club and was later seen being carried out of the venue by her bodyguards after apparently having too much champagne.

However, the 25-year-old star's unsteady exit was later blamed on exhaustion. A source said, "Not only is she very little but she was quite tired because she's in the middle of her tour. She only sipped a few glasses of Veuve Clicquot champagne and one vodka shot. Her party still ran up a pretty sizable $2,600 bar bill, though."

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