Mariah Carey's dog pees in dressing room

Mariah Carey's dog urinated in her dressing room, interrupting rehearsals for a Las Vegas gig.

The singer's Jack Russell Cha Cha leapt on Carey after weeing on the floor.

She wrote on Twitter: "Cha Cha just peed on the floor in my dressing room and then decided to jump on top of me as I am doing my make-up. 'Real classy' here."

Cha Cha was a wedding anniversary present from Carey's husband Nick Cannon.

Carey is performing over two nights at The Pearl in Las Vegas.