Demi Lovato, Katy Perry and Jason Derulo are teaming up to find some talented cover artists.

(Source: @ddlovato/Instagram, @katyperry/Instagram, @jasonderulo/Instagram)

The Best.Cover.Ever series is on YouTube with Demi, Katy and Jason among the stars joining Ludacris to judge cover versions of their hits by aspiring artists from around the world.

The winner will then get to duet with them.