Britney Spears, Nicki Minaj, Ke$ha debut 'Till The World Ends' remix cover art

Nicki Minaj and Ke$ha may have lent their voices to Britney Spears' "Till The World Ends" remix, but they apparently couldn't get it together for a photo shoot.

Not that we're surprised -- these pop princesses are some of the busiest ladies in the business -- but when Spears dropped the cover art for their new single via Twitter, we still thought it looked pretty fierce.

Brit-Brit showed her ladies some love, tweeting "@NickiMinaj @Keshasuxx Too much fierceness for one cover! Thanks for lending your voices girls... #TTWEREMIX."

The photo features cover photos from each of the ladies' respective solo albums with the title "Till The World Ends (... The Femme Fatale Remix). The dollar sign is noticeably toned down in Ke$ha's name, and we kind of like it.

The official track was released on Monday (Apr. 25) morning -- listen to it here. We don't know about you, but hearing Minaj growl "It's Britney, b****" gets us real pumped up for the Femme Fatale Tour. We only wish Ke$ha would join in for a special appearance!