Coldplay star Chris Martin is to appear as a guest mentor in the current season of American Tv talent show The Voice.

The singer will assist all four coaches during the singing competition, beginning 31 March (14).

Martin, who was rumoured to have been in talks to replace Keith Urban on The Voice Australia, will join Miranda Lambert, Aloe Blacc, Jill Scott and The Band Perry among the guest mentors for this season.

The guest stars join coaches Blake Shelton, Usher, Shakira and Adam Levine.