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HERES a perk of being Emma Watsons co-star.

The actress stripped down to her undies for a movie scene in which actor Logan Lerman gropes the Brit stars brassiered boob.

She buries memories of her Harry Potter past in her coming-of-age role in The Perks Of Being A Wallflower, out next Monday on DVD.

Emma can be seen standing in her smalls as she gives Logans character a taste of intimacy, planting his hand on her breast.

The film stars Logan as a shy college freshman whos taken under the wing of two seniors Emma and Ezra Miller.

Its based on a book of the same name by Stephen Chbosky.

Coming-of-age ... Emma Watson and Logan Lerman

More senior roles are in the pipeline for Emma next up shes appearing alongside Leslie Mann in crime caper The Bling Ring, from Lost In Translation director Sofia Coppola.

She also teams up with contemporary comedy favourites Seth Rogen, Jonah Hill, Jason Segel and Paul Rudd in This Is The End.

Another future release sees her starring alongside Russell Crowe and Anthony Hopkins in Noah, a biblical epic based on the titular characters visions of an apocalyptic flood.

Pants scene ... Emma Watson and Logan Lerman