Kelly Osbourne is incensed about Christina Aguilera calling her “fat” in the past.

The 26-year-old reality star holds a bit of a grudge against the Beautiful singer. When speaking about Christina’s appearance at last week’s Michael Jackson Tribute Concert, Kelly expressed boldly expressed her sentiments.

"She called me fat for years," Kelly said on E!’s Fashion Police Friday programme.

"I was never that fat."

Donning fishnets and a corset during her performance, many viewers commented negatively on Christina’s outfit. Kelly did not think the singer’s appearance was flattering.

"Trust me," Kelly said. "I'm a [size] 2/4. That is not a 2/4."

Kelly has spoken about her views on Christina’s weight before. She vocalised her opinion on the matter in August on the same show.

"[Christina’s a] fat b***h,” Kelly said. “She called me fat for so many f**king years, so you know what? F**k you! You're fat too."

Kelly has struggled with her own weight problems in recent years.

The singer lost 48lbs during her stint as a contestant on reality programme Dancing with the Stars in 2009 and has successfully kept the weight off since.

Kelly did not appreciate being derided for her voluptuous frame.

“I took more hell for being fat than I did for being an absolute raging drug addict. I will never understand that," Kelly told Us Weekly last year.

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