The 'Masked Singer' host and 'All I Want for Christmas Is You' singer were married for six years before splitting in 2014

On Tuesday, clips from Mariah’s concert shows her stopping the show to say hello to Rihanna, who says almost immediately that she wants Carey’s signature. After locating a Sharpie, Rihanna tells Carey, "Sign my tit, because my man made me get you."

Nick Cannon and Mariah Carey were married for six years, from 2008 to 2014, and share 13-year-old twins, Moroccan and Monroe. Despite their divorce, they maintain a supportive co-parenting relationship.

Nick Cannon Says Mariah Carey Signing Rihanna’s Breast Was ‘Hot’ | TMZ Nick Cannon was in the house to see his ex-wife Mariah Carey leave her mark on Rihanna's breast ... and he says more women should follow their lead.