Kelly O: I'll KO pap

Kelly Osbourne has slammed a photographer for using Joan Rivers to get her attention.

The Fashion Police host was very close to her co-star, who passed away aged 81 in September, following complications caused by minor throat surgery.

Now the 30-year-old has taken to Twitter to complain about a paparazzo who used her grief to get a picture at an event.

"To the insensitive photographer on the red carpet who yelled "look at me. Its for Joan!" you are a #SickAssHole! Not to mention f**ked up!" she angrily vented to her followers.

"I do not advocate violence however he is one person I would like to K.O! #KnockOut (sic)"

Recently it was announced that Kathy Griffin would take over from Joan on the show. The new series will start filming in January, with Kelly unsure of how she feels.

"I'm excited but terrified at the same time," she told Us Weekly. "Change isn't fun, but it has to happen. This situation f**king sucks."

It's also tough for Kathy, 54, who has big boots to fill. According to RadarOnline, she's had some negative feedback about taking over.

"People are tweeting Kathy things like 'you will never be Joan,'" a friend told the website.

"She is also hearing that she has no sense of fashion. But she doesn't have to! She has an eye for what's hot and Kathy is sarcastic and honest - just like Joan."

Fashion Police will be back for the Golden Globes in January next year.