Britney Spears has confirmed she has collaborated on will.i.am's next single Reach for the Stars.

Reach for the Stars will be the first song played on Mars via the Mars rover Curiosity which landed on Mars earlier in the month.

Britney tweeted, "Can't wait for y'all to hear @iamwill's next single featuring me. Coming very soon. Stay tuned people...."

She also tweeted, "Just left the studio w/ @iamwill working #willpower. Look out 4 #reachforthestars beamed 2 earth from mars tmrw via my friend @MarsCuriosity."