The second single from Britney Spears' upcoming album Femme Fatale was posted on the internet on Thursday, and the upbeat dance anthem Till the World Ends has some pundits predicting a club hit.
Tracks leaking online has long been a problem for musicians, although Spears quickly took to Twitter to promote the "formal premiere" of the track on Ryan Seacrest's radio show on Friday.
Her record label also brought forward the single's digital release, making it available on iTunes on Friday, several days earlier than originally planned.
Britney has announced the full track listing for Femme Fatale, which goes on sale on March 29.
The new album will feature 12 tracks, with four extra songs available on the deluxe edition.
"I think Femme Fatale speaks for itself ... I wanted to make a fierce dance record where each song makes you want to get up and move," Spears said.
