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Smith buffs up for film

Margot Robbie and Will Smith. Picture: AP

W *ill Smith *'s * *wife told him he had to hit the gym before he could share the screen with *Margot Robbie *.

The Aussie beauty plays Smith's love interest in crime comedy Focus, which made his wife, *Jada Pinkett Smith *, worry about his physique.

"Jada saw Margot and she said 'You're going to the gym right now. You need to be in shape. Do not walk on set with that girl and embarrass me'," Smith, left with Robbie, told reporters at the flick's London premiere. "So we went to the gym and we trained a lot. I got it together and I think it turned out OK. When you're on camera with Margot Robbie, you've got to have it all the way together."

Robbie and Smith's chemistry on set sparked rumours of an affair last year, forcing the ingenue to take to Twitter to deny an off-screen relationship with her co-star, who has been married to Pinkett Smith for 17 years.

However, Smith was more than happy to talk about his co-star yesterday ( *WA * time) and even joked about how some of their intimate scenes had to be edited, because "there was a whole lot of sexiness going on". "You can't buy chemistry. She is fantastic. She's 24, bright and excited and that energy is really inspiring," Smith, 46, said.