Megan Fox isn't afraid to kiss and tell!

The "Teenage Mutant Ninja Turtles" star recently revealed her best onscreen kiss -- and we were very surprised by her answer.

"Shia LaBeouf," she told E! News

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With other kissing costars including Josh Brolin in "Jonah Hex," Amanda Seyfried in "Jennifer's Body" and Adam Scott in "Friends With Kids," we didn't expect her to name the "Transformers" actor. 

In fact, the pair's chemistry translated off set as well!

LaBeouf told Details magazine that he hooked up with Fox while they were filming the action-packed flick.

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"Look, you're on the set for six months, with someone who's rooting to be attracted to you, and you're rooting to be attracted to them," he revealed in 2011. "I never understood the separation of work and life in that situation. But the time I spent with Megan was our own thing, and I think you can see the chemistry onscreen."

Talk about putting it all out there!

Are you surprised by Megan's answer? Tell toofab in the comment section below, and click "Launch Gallery" above to see more kissing costars.