Nick Cannon is reportedly begging Mariah Carey not to marry James Packer.

The 35-year-old 'America's Got Talent' host, who split from the 46-year-old singer in June 2014 after six years of marriage, reportedly feels she is rushing into things with the Australian billionaire and is terrified they'll walk down the aisle soon.

A source told In Touch Weekly: ''Nick is begging Mariah not to marry James.

''He likes being the only man in Mariah's life. Friends even think he would get back together with her if he had the chance.''

The former couple have four-year-old twins Moroccan and Monroe together, and Nick is worried about the threat of another father figure.

The insider added: ''Nick will always feel connected to Mariah.

''He loves the co-parenting groove they've been in and he's worried that might change if she gets married to someone else.''

It was previously reported James is eager to marry Mariah as soon as her divorce from Nick is finalised.

A source said: ''James wants to marry her sooner rather than later, and she is very open to the idea.''