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Mae Whitman dressed down for Harry Potter premiere

Mae Whitman had to dress down for this year's (11) big Harry Potter premiere in London, so as not to upstage pal Emma Watson.

The Potter-obsessed Parenthood star was invited to the Trafalgar Square premiere by Emma Watson, who befriended her on the set of new film The Perks of Being a Wallflower - and Mae Whitman admits she desperately wanted to dress up for the big bash.

She says, "I stayed at my friend Emma's house (while I was filming in London)... and I got to go to the premiere of Harry Potter and the Deathly Hallows Part 2. I'm the biggest, nerdiest Harry Potter fan ever. It took every last ounce of strength I had to not dress up; I didn't want to embarrass Emma."