Kelly Osbourne Kelly Osbourne

Of the various battles Kelly Osbourne has waged in her life, she was surprised that weight became the focus of her struggles.

Kelly Osbourne: I would have died without rehab

Osbourne, who went through rehab for drug and alcohol addiction three times, told US Weekly: "I took more hell for being fat than I did for being an absolute raging drug addict. I will never understand that."

The 25-year-old daughter of Sharon and Ozzy Osbourne said she hated herself while battling her weight problem, and what made it worse was how public it became.

"Some horrible obnoxious teenager screamed out a car window to me, 'You're fat!' I went to my parents bawling, 'I would rather be called ugly than be called fat!'" she said.

Kelly Osbourne and Louis van Amstel: Dancing journey is like miracle on ice

After trying extreme diets that left her "sick and shaking," Osbourne — who placed third in Dancing with the Stars' Season 9 — has lost 42 pounds the old-fashioned way: diet and exercise.

"I'm really proud to look in the mirror and not hate every single thing I see," she added.