Reality TV star Jack Osbourne is unfazed by his father Ozzy's global fame - but finds it difficult to cope with his mother's success. The Adrenaline Junkie star, 21, still finds it hard to adjust to Sharon's popularity in the U.K. and in the U.S. - and misses her playing mum at home. He says, "With my mum it was hard to get used to the fact she was on TV all of the time, and then she's my mum at home. "She's got to entertain people so she's not going to be on the phone, doing business and holding the dog. "She has a persona to keep up with, and I had to get used to that."