Jack Osbourne knew his weight loss had significantly changed his appearance for the better when his own parents didn't recognise him.

The formerly chubby son of Black Sabbath rocker Ozzy and his wife SHARON broke the back of his flab during an extensive detox programme in Thailand, as he also fought his alcohol and drug addictions.

And he emerged after weeks spent in semi-isolation a changed man - much to the delight of his parents.

He recalls, "It was a real shock to them. I hadn't seen my mum for a couple of months. She was so excited and happy for me because she used to have a weight problem herself."