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Harry Potter princess Emma Watson was spotted leaving Mahiki in London last night, and it looks like she was in a celebratory mood, as she just confirmed she's set to play Sam in The Perks of Being a Wallflower. Emma tweeted, "Hi all, just wanted to tell you that for once a story in the papers is true. I'm filming Perks of Being a Wallflower this summer. Can't wait! x"

The film is about a troubled young teen named Charlie (played by Percy Jackson & the Olympians star Logan Lerman) and his lady friend Sam, and it covers everything from death to homosexuality to abortion. While that project is still in the pre-production phase, fear not -- we'll be seeing the starlet in Harry Potter and the Deathly Hallows: Part 2 this July, and later in My Week with Marilyn, where she stars opposite Michelle Williams.