Britney Spears’ 27th birthday party Tuesday night ended up being quite a circus.

Literally.

To tie into the release of her latest album Circus, NYC hot spot Tenjune was transformed into a giant circus tent, complete with with a hot dog stand and popcorn and cotton candy machines emblazoned with the pop star’s name and even a man on stilts and jugglers.

Outside the club, a huge screen projected circus imagery.

Spears – who had taped a speech to air on the upcoming Rockefeller Center New York City Tree Lighting Ceremony special earlier in the day – arrived in a low-cut Roberto Cavalli cocktail dress that showed a lot of cleavage.

She smiled throughout the night as she mingled with guests, including her mother Lynne Spears, her manager Larry Rudolph, Lance Bass, Jeremy Piven, Robert Buckley and Ciara.

As she was presented with a cake — featuring sparkling candles that tied into the bash’s circus theme — Barry Weiss, CEO and president of Jive Records, told the singer, “We are so proud and so happy to be a part of your life. Looking at your two boys today, it’s an amazing experience.”

So what’s Spears’ birthday wish?

“A million more wishes! Definitely!” she told Entertainment Tonight.

Added pal Bass, “I’m so proud of her! The album’s amazing. I love when people do themes for their albums. A circus is a lot of fun.”

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