Mariah Carey had to take to the stage soaked in wee after her dog urinated on her.

The 40-year-old singer was devastated when Jack Russell terrier Cha Cha had an accident as she was getting ready to perform.

Mariah - who is due to perform in Las Vegas on Friday (September 11, 2009) and Saturday (September 12, 2009) – wrote on her Twitter page: "OK so 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."

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It is believed Mariah was practicing for her upcoming shows when the toilet trouble occurred.

The "Obsessed" singer's husband Nick Cannon gave her the mutt to celebrate their one-year wedding anniversary in May.

Mariah is not the first celebrity to suffer the embarrassment of an animal urinating on her.

Katy Perry was mortified when a monkey relieved itself on her during a magazine shoot.

She said: "Jeremy Scott is one of my all time favorites and he shot the pictures while I got to prance around in his creations."

"I had a chimp on set with me that day. Fun fact, she peed all over me, I had to take a shower in the middle of shooting."