Sharon Osbourne left daughter Kelly with missing skin when she waxed her moustache.
I'm forever turning to her and saying, 'What's wrong? You look like you've seen a ghost.' She'll say, 'No, the Botox went wrong again.'
Kelly revealed her mother tricked her into removing her facial hair when she was a teenager, and found it hilarious when the procedure went wrong.
She explained: "My first waxing experience was with Sharon when I was 14. 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, 24, also claims Sharon is "addicted" to plastic surgery - Sharon has previously estimated she has spent at least Â£300,000 on procedures - adding she dislikes it when her mother goes under the knife.
Referring to wrinkle-smoothing injections Botox, Kelly explained in her autobiography 'Fierce': "She says, 'I'm just going in for a routine op.' There's nothing routine about getting your t**s done!
"We'd say, 'Mum, you've had Botox again.' She'd reply, 'No, I didn't.' 'Yes you did - you're head is f***ing bleeding,' we'd say in unison.
"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.
"I'm forever turning to her and saying, 'What's wrong? You look like you've seen a ghost.' She'll say, 'No, the Botox went wrong again.' "