Britney Spears will parade through New York to celebrate her upcoming birthday in a wild, circus-themed party, according to reports.

The pop star is marking her 27th birthday on 2 December with the release of her highly-anticipated comeback album, Circus.

She's scheduled to start the day taking over American TV sets with an eye-popping performance on chat show Good Morning America.

And, according to the New York Post, Spears' antics will continue with an all-out bash at star-studded nightclub Tenjune.

A source tells the newspaper her party will be "a very private, Circus-theme event".