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Jack Osbourne has angered sister Kelly after he agreed to take part in a car race from London to Mongolia because she thinks it's a stupid idea.
Jack, who presents TV show Adrenaline Junkie, decided to go on the rally, despite being asked not to by his celebrity parents Sharon and Ozzy Osbourne.
Kelly, who is getting ready to make her debut in hit musical Chicago, is not happy about her brothers choice of hobby, saying: "I think all these car races are really stupid, he could kill himself.
"My parents told him not to do it and he went anyway. He said he was speeding at 100 miles an hour on a dodgy motorway. That's not cool. It's stupid."
