*People.com has the scoop on Mariah Carey’s blue-and-pink baby shower held Sunday at The Conservatory Grill at the Montage Hotel in Beverly Hills… The parents-to-be arrived at 7 p.m., with Cannon, 30, behind the wheel of a black Rolls-Royce that he gave Carey, 41, as a Christmas gift. They were joined by friends including “American [...]