Britney announced via her Twitter page that she will appear on the track, which will be released shortly.
Brit tweeted: "Can't wait for y'all to hear @iamwill's next single featuring me. Coming very soon. Stay tuned people...."
"Just left the studio w/ @iamwill working #willpower. Look out 4 #reachforthestars beamed 2 earth from mars tmrw via my friend @MarsCuriosity.