The 'Transformers' actress romps topless in bed with 'Mamma Mia' star Amanda Seyfried in zombie film 'Jennifer's Body'.

A source said: "The two girls make out hardcore, rolling around in a bed. It was a really hot scene."

In 'Jennifer's Body', Megan plays a possessed cheerleader who goes on a killing spree murdering her male classmates.

Megan recently hinted she would be sharing a passionate smooch with her co-star Amanda, revealing: "I eat and seduce everyone. There's a lot of kissing everyone – boys and girls. All kinds of craziness."

This isn’t the only highly-anticipated big screen lesbian kiss. Scarlett Johansson recently revealed she enjoyed locking lips with Penelope Cruz in new Woody Allen movie 'Vicky Cristina Barcelona'.

She said: "Everybody wants to know what it was like. Penelope had less facial hair than a guy so it was certainly more pleasant. It was better than kissing Jonathan Rhys Meyers in 'Match Point'."

'Jennifer’s Body', also starring Adam Brody and J.K. Simmons, hits cinemas worldwide in 2009.

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