Britney Spears' 'Till The World Ends' Hits Web

Femme Fatale's second single was penned by Ke$ha.

Britney Spears' new single, "Till the World Ends," sounds poised to be a club smash. The Ke$ha-written, Dr. Luke/Max Martin-produced track was posted by Perez Hilton on Thursday afternoon (March 3), after speculation earlier in the day that the song would hit radio next week.

"Till the World Ends" is a swirling, "beat the beat" track, ready for late nights spent "dancing till the world ends" as she sings on the fast-paced party jam. "This kitten got your tongue tied in knots I see/ Spit it out 'cause I'm dying for company," a confident Spears purrs.

As the song slows for a moment — during a break before she moves her way to the chorus — she sings, "I can't take it take it take no more/ Never felt like felt like this before/ Come on get me get me on the floor/ DJ, what you what you waiting for?" she teases.

The beat chugs in the background as synths play with Spears' sex-kitten delivery of lines like "Watch me move/ When I lose, when I lose it hard/ Get you off with a touch/ Dancing in the dark.

"See the sunlight/ We ain't stopping/ Keep on dancing till the world ends/ If you feel it/ Let it happen/ Keep on dancing till the world ends," she sings as the song breaks down, fading out for a brief moment (revealing her signature breathiness), and then coming back in as she repeats those final lines again to close the song.

Ke$ha recently dished about the track to, noting that it is about the power of an artist performing a great gig. "That song is me imagining her and any female musician touring the world," she said. "You know, when you go out, and you're having an amazing, magical night and you don't want to go to sleep and you want it to last until the world ends."

"Till the World Ends" is the second single from Femme Fatale, set to drop March 29. Its lead single, "Hold It Against Me," was an equally club-friendly jam by Luke and Martin, who are overseeing production on the album.

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