She's only been married to hubby Tom Ackerley for two years, but sources say the 27-year-old blonde beauty was already being faced with temptation from her hunky co-star.
"Tom has reason to be worried," an insider said. “Brad is very taken with Margot, and their chemistry is the talk of the cast."
And on the heels of his divorce from Angelina Jolie, Pitt, 54, is back on the hunt and Robbie's said to have "all the qualities he loves in a girl and if she wasn’t married there’s no doubt whatsoever he’d be asking her out in a heartbeat."
After years of relationship torment with Jolie, 43, the actor was feeling at peace working with a woman he enjoyed the company of. "They get along very well, and Brad’s super excited to be working with her, more than he’s been in years with a leading lady."
But the fact Robbie's married has thrown a wrench into Pitt's plan of winning his female co-star's heart. The sources told RadarOnline.com exclusively: "This has to be hard for Tom, who’s a trusting guy but anyone in his position would find it tough."
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