Jack Osbourne fires back at critics commenting on his recent weight loss. On TikTok, Ozzy Osbourne's son addresses comments he looks 'grossly underweight,' calling it 'f**king insane.' The 40-year-old also states, he currently weighs 155 lbs., which is normal for someone of his height. This comes after his sister, Kelly, slammed her own weight-loss critics. ET's Nischelle Turner chats with Jack about his viral video; he shuts down rumors he is sick, saying he is in 'insanely' good health as he launches a new streaming venture called Spark. He also posts the podcast 'Trying Not to Die.'
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