Margot Robbie admits kissing Leonardo Dicaprio wasn't very fun.

The 23-year-old beauty plays the 39-year-old actor's wife in the new movie 'The Wolf of Wall Street' and, although she admits he's a ''great'' kisser, she insists locking lips with the hunky star wasn't as sexy as it seems.

She said: ''All of my girlfriends interrogated me and asked, 'Is he an amazing kisser?' I'd sit them down and say, 'All I know is his screen kissing is great.' Then they'd get upset and say, 'Tell me it was romantic and there were fireworks.' There weren't any. You do the takes in 17 hours, and it's just hot and sweaty.''

However, Robbie insists it was a dream come true being able to work with DiCaprio, who picked up a Golden Globe award for his role of Jordan Belfort in the film, and she developed a sibling-like bond with him.

Speaking to PEOPLE, she explained: ''I'm still pinching myself. I'm extremely honoured to be a part of this film. To work with Leo was unbelievable. He has always been my favourite actor and he became this wonderful big brother. He took me under his wing and always looked out for me, which is really nice.''