Alicia Silverstone fears being overshadowed by Britney Spears. The "Clueless" star has opted out of guest starring in "How I Met Your Mother" because the pop singer is also starring in the same episode, it has been claimed.

Silverstone was supposed to play a hot doctor that lead star Ted, played by Josh Radnor, has a serious crush on. But apparently, the 31-year-old actress bailed out after learning the doctor's receptionist will be played by Spears, which might possibly overshadow her.

Kim Cattrall has donated the fur coats she wore in "Sex and the City: The Movie" to PETA.

The stunning actress wore the furs in four separate takes for a scene filmed at New York Fashion Week where her character Samantha Jones feels the wrath of animal rights protesters who throw red paint all over her.

Christina Applegate has posed nude for PETA in a bid to stop shoppers from buying fur this Christmas.

The "Anchorman: The Legend of Ron Burgundy" actress is pictured wearing just a pair of red gloves with green cuffs for the animal rights group's e-card.

Cindy Crawford has angered PETA by appearing on the cover of Russian Vogue wearing a fur coat.

The 41-year-old model - who infuriated the animal rights group in 2004 when she agreed to be a spokesperson for their anti-fur campaign before modelling for exclusive mink clothing range Blackglama - has sparked furthercontroversy by gracing the cover of the well-respected fashion magazinesporting fur.

Leona Lewis would never pose nude because she isn't confident enough. The 'X Factor' winner - who is a fiercely proud vegetarian and refuses to wear leather or fur - is too shy to follow in the footsteps of 'Clueless' actress Alicia Silverstone and shed her clothes for PETA.

She told BANG Showbiz: "I'm not that confident! I think it's a strong statement, and I really respect it because it's for a great cause. I would love to do something for great causes like that, but I just don't think I could pose nude, because I'm not that brave."