More rumours of Pink's alleged infidelities have surfaced today, further fuelling reports her marriage is in trouble.

According to reports, the singer - who has been plagued by rumours her relationship with her husband Carey Hart is on the rocks - has been spotted "making out" with a mystery woman at Santa Monica's Viceroy Hotel.

A source told Australia's New Weekly magazine: "She was flirting the way you'd expect her to flirt with a man, cuddling and being overly affectionate. They were making out."

Pink's representative has strongly denied the star is having a lesbian fling, and insists Pink was just enjoying a night out with her friends.

Carey was reportedly seen dirty dancing with a mystery brunette on a drunken night out without his wife.

A source said: "He was having a great time. Pink wouldn't have been happy!"

The reports have surfaced just weeks after it was claimed Pink was regretting agreeing to an open marriage.

A source said: "Divorce is just around the corner. Carey has this one blonde in particular that he takes everywhere, even public appearances. But Pink knew what she was getting into!"

Pink allegedly agreed that Carey could "play away from home" while she is on tour, but is now getting broody and wants to start a family.

She was recently overheard telling friends at Hollywood restaurant Eleven that she wanted time apart from Carey after just 21 months of marriage.

A source said: "She told them, 'We're just not getting along anymore. We each need our space. We need our distance. It's not like it was when we first started.' "

When asked about their marriage in September, Carey, 32, said "everything's fine".

A representative for Pink, 28, branded rumours the couple are splitting up as "complete bulls**t."