Mariah Carey reportedly 'breaks down a lot' following her split from Nick Cannon.

The 44-year-old singer and her husband tied the knot in 2008 but recently separated after months of speculation surrounding their marriage. To show this decision is serious, Nick, 34, took drastic measures in getting the 'Mariah' tattoo on his back covered up, unveiling a new crucifix design earlier this month.

This move is said to have shocked Mariah, who is reportedly struggling to come to terms with the breakdown of her nuptials.

'Mariah's pals are worried she's falling apart. She was stunned when she saw Nick's tattoo, especially since they only split in May,' a source told British magazine Closer. 'She breaks down a lot and last week she struggled to keep it together on stage.'

She was criticised for her poor vocals during a performance in Japan earlier this month, with concertgoers slamming her voice.

Mariah, who has twins Moroccan and Monroe with Nick, made things personal throughout the show by changing the lyrics to one of her songs, adding the line: "I know you cheated, motherf**ker". She is said to be convinced her spouse had an affair during their marriage, and is apparently pestering her entourage for details of his love life.

'Mariah thinks the only reason Nick has covered up the tattoo is because another girl doesn't want to look at it,' the source added. 'She's been asking her staff whether they know if Nick is in a relationship.'

She is also said to have turned to close pal Nas to play matchmaker and set her up with a new beau.