Los Angeles - Alexander Skarsgard "lived vicariously" through Margot Robbie while filming The Legend of Tarzan.
While the 39-year-old actor was on a strict diet and exercise regime for his titular role in the movie throughout the eight-month shoot, his Australian co-star was under no such restriction so he used to enjoy quizzing her about the meals she had eaten and the parties she'd been to away from the set.
He said: "From the first meeting, we had a very, very strong connection and she's so much fun. None of that Hollywood diva stuff.
"She likes to just hang out and go to a pub and drink beer - she's very adventurous.
"And since I was on a strict training and diet regimen - no alcohol, no dessert, nothing - every Monday, I'd see her on set and ask, 'All right Margot, what happened this weekend? What did you do? What did you eat?'
"She'd say, 'Are you sure you want me to tell you?' And I'd be like, 'You have no idea. - I want to know.' So I lived vicariously through her for eight months."
Alexander is hopeful his on-screen chemistry with Margot, who plays his love interest Jane, will prove very effective in the finished film.
He told heat magazine: "Margot and I didn't have much time to establish that connection, but it was quite easy.
"Margot is so lovely and so charming that it doesn't take long for the audience to fall in love with her, so hopefully they'll be rooting for us to be together."
And the hunky star - who is dating Alexa Chung - also enjoyed teaming up with Samuel L. Jackson for the shoot.
He said: "It's just such a treat to work with actors who are not only so incredibly talented, but just decent human beings. It was incredible.
"Sam is so much fun. No ego at all. Just super-chill, super-fun, really hard working, but very humble."
See pics of Alexander here: