With her big comeback CD release, as well as turning 27 years old, Britney Spears had a lot to celebrate yesterday (December 2). And she started off her night by taping her appearance at Rockefeller Center for the New York City Tree Lighting Ceremony.

A source told press that the arrangements for the “Gimme More” singer’s involvement changed several times before she finally decided to just pre-tape the whole thing.

“She was originally supposed to perform live and then she wanted to pre-tape her performance instead. Then she didn’t want to do that. She keeps changing her mind and now she’s not performing at all but she is still supposed to pre-tape at 7 p.m.”

Once she was finished with that whole ordeal, it was time to party! And Brit Brit slipped into a very sexy cleavage-baring silver and black dress and headed over to Tenjune night club where she celebrated her birthday in style.

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Enjoy the pictures of Britney Spears celebrating her birthday last night (December 2).