Though only two weeks have passed since Britney Spears premiered the (disappointing, product-placement-run-amok) video for “Hold It Against Me,” the soon-to-be Princess of the Castro is already pushing a second single from the forthcoming Femme Fatale, “Till The World Ends.”

While Dr. Luke, the album’s executive producer, has been posting snippets of different tracks in recent days, “Till The World Ends” wasn’t one of them. But the song leaked in full yesterday, prompting the single’s fast-tracking to for-sale status. Ke$ha, a close Dr. Luke associate, had a hand in co-writing “Till The World Ends,” a club-set raver (surprise!) that shares a stuttering sound found on her own new single, “Blow” (not to mention a similarly apocalyptic title).

Purchase Britney Spears – “Till The World Ends” via iTunes.