Nick Cannon worked on the set of wife Mariah Carey's video shoot for her single "I'll Be Lovin' U Long Time" in Oahu, Hawaii, on June 9. But instead of co-starring as Mariah's love interest, Nick, 27, assisted the pop star between takes. Some close to the couple fear Nick's subservient status is a sign the couple's union is headed for trouble. "I give the marriage six months, tops," reveals an insider close to Mariah. "I can't see it lasting." Read more about Mariah and Nick's crumbling relationship in the latest issue of Life & Style, on newsstands now!

Read more at: http://www.lifeandstylemag.com/2008/06/mariah_and_nick_problems_alrea.php.