Britney Spears: Inside Her New York Birthday Party

Tue., Dec. 2, 2008 7:15 PM PST by Marc Malkin

Frank Micelotta/BS/Getty Images for Zomba Label Group

Britney Spears can't stop turning 27—or at least celebrating it, anyway.

Not only did she have a candle-covered cake at a London nightclub on Saturday, but just this morning she was serenaded by celebs like Hugh Jackman after her "Womanizer" performance on Good Morning America.

And as I type this, the doors are open for her big circus-themed bash at New York's Tenjune nightclub. Already inside are Heidi Klum, Lance Bass and Lipstick Jungle's hot guy Rob Buckley. And the lady of honor just arrived in a little gray and black dress with "major cleavage," says a partygoer.

Inside, according to a partygoer, the place is done up like a circus tent with a hot-dog stand and popcorn and cotton-candy machines emblazoned with the pop star's name. And outside, there's a huge screen projecting circus imagery.

There's even a dude on stilts. (If you haven't heard by now, Brit-Brit's new album is called Circus.)

Make sure to click back later for more details. No doubt the party will be going until the wee hours. But until then, the circus goes on in our Britney B-Day gallery.