Singer Ke$ha, who penned Till The World Ends, tells MTV.com she can't believe she's played such a role in Britney's career.
"I consider myself a songwriter before and above everything else, so it's an honor to write for one of pop music's biggest icons," says Ke$ha. "And I hope it gets everyone's ass on the dance floor cuz y'all know that's what K-Monay does best!"
Last month, Ke$ha talked with Spin.com about the song, saying it's about the power of an artist performing an amazing show. "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."