Alicia Silverstone reportedly pulled out of US TV show 'How I Met Your
Mother' after learning Britney Spears was appearing in the same episode.

The 'Clueless' star - who is a huge fan of the hit series - was scheduled to
appear in the 14th episode of the season but dropped out after deciding it
would be too "chaotic".

A source close to the actress said: "Alicia was really excited about
appearing on the show, but when she found out she would have to share the
spotlight with Britney she wasn't too keen.

"She knows that everyone would be going out of their way to look after
Britney, and it would be so chaotic nobody would look after her."

Alicia will reportedly be replaced by 'Scrubs' star Sarah Chalke in the
episode which sees Britney play "sweet and nerdy" secretary Abby.

Meanwhile, 'How I Met Your Mother' creator Craig Thomas has revealed how
Britney got her guest slot.

He told Us Weekly magazine: "Britney's people said she was looking for a
small part on a funny show, and she checked out our show and liked it. Her
people were really receptive to the idea of bringing her in and just doing a
funny role for her. It all came together really quickly - it was kind of
shocking.

"She seemed to click with the rest of the cast and fitted right in! She was
having a good time. She was laughing. It's a very sweet, romantic episode,
so the vibe in the room was just very fun. Everyone was having a good time,
and I think she had a good time too."