La Beouf also opens up about other failed romantic entanglements. Just sort of experimenting or whatever." PHOTOS: Megan's sexy Transformers style On his ex-girlfriend Carey Mulligan, with whom he parted ways in October 2010: "I still love her...

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films -- and he's not sure whether or not his sexy costar was attached at the time to then-boyfriend Brian Austin Green, now her husband. I don't know," he says, repeating "I don't know" eight more times.

PHOTOS: Stars who've hooked up on set Nodding in the affirmative about a hookup with Fox, La Beouf explains in a new mag interview, "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." Without giving specific dates or details, the 25-year-old actor (now dating Hollywood stylist Karolyn Pho) continues of the fling: "I never understood the separation of work and life in that situation. "It was what it was." Fox, 25, wed on-and-off beau Green one year ago in Hawaii.

But the time I spent with Megan was our own thing, and I think you can see the chemistry onscreen." PHOTOS: Megan Fox's body over the years When asks him about Fox's status at the time with Green, he sputters. She was famously replaced by Rosie Huntington-Whiteley for , out next month.

(Director Michael Bay and La Beouf recently confirmed that Fox's controversial comments about Bay, comparing him to Hitler, got her dropped from the franchise -- at the direct order of executive producer Steven Spielberg.) PHOTOS: Megan Fox and Angelina, separated at birth?

But he had another card to play in his son from a previous relationship, Kassius, whom Fox has boasted of mothering since he was three — and she was eighteen.

The Lesson: Kids are a great way to get a woman to stick around... Spouse: Jessica Alba /// Wed: 2008 The Background: They met during the filming of Fantastic Four — she was the lead actress, and he was a... Okay, she wins the battle of the resumés, but he would soon go on to form a production company with high-school pal/NBA All-Star Baron Davis.

Plus, it's no shock a good-looking Yale grad did okay on the dating market. Spouse: Megan Fox /// Wed: 2010 The Background: In the 1990s, the world was his oyster — his character on Beverly Hills, 90210 was such a big deal that he could even release an in-no-way-utterly-embarrassing rap album.

Congratulations are in order for Megan Fox and Brian Austin Green, who just welcomed their third child together!

The 30-year-old actress gave birth to a baby boy named Journey River Green on Thursday (August 4), according to E! This is the third son for Megan and Brian, who are also the parents to Noah, 3, and Bodhi, 2.