Former Jonas Brothers star Kevin Jonas has traded in his microphone and guitar for a hard hat after co-founding a building firm in New Jersey - and he has already landed a big client.

Jonas is helping The Real Housewives of New Jersey star Kathy Walkie realise her property dreams by signing on as her contractor.

Jonas pops up as her mystery builder in an upcoming episode of the hit reality show, which will air in America on Sunday (28Sep14), when he's unveiled as the man behind the renovation at her Franklin Lakes home.

When Walkie's sister Rosie recognises the pop star, he explains, "That was my day job. Now I'm doing this."