Kelly Osbourne has revealed that her mum, Sharon, once peed on her whilst trying to wax her top lip.

In her autobiography Fierce, Kelly tells how her mum ambushed her at the tender age of 14.

Kelly said: “She shouted, ‘Darling, come here’. She was standing with a little pot and plastic spatula and said, ‘Lie on your back for a minute’. She straddled my stomach, and smeared the wax on my top lip.

“I screamed in pain. She’d heated it for too long. She did eventually pull it off but half my skin went with it. To make it worse, she was laughing so hard she weed on me.”

Kelly also revealed that she is not happy about her mums continual use of plastic surgery.

She added: “She says, ‘I’m just going in for a routine op’. There’s nothing routine about getting your t*ts done!

“Once she had her lips plumped. We were sitting around Sir Elton John’s dining room table and he said, ‘Sharon, what the f**k has happened to your lips?’ We all burst out laughing. He sent her to a doctor to get it fixed.”