Fresh Prince of Bel-Air star Will kept things smart in a beige jacket and navy polo neck top, while former Neighbours actress Margot stunned in a monochrome jumpsuit.
Keeping it chic, Margot covered up in a black coat and she joined Will on stage as the pair posed for photographers.
However, proving that she's not just a pretty face, Margot managed to pick pocket Will without him realising!
While standing for photos, 24-year-old Margot slipped her hand into Will's back pocket before proudly flashing his wallet behind his back for all to see.
Focus tells the story of veteran con artist Nicky (Will Smith), who takes a novice named Jess (Margot Robbie) under his wing, but things get complicated when they become romantically involved.
At a press junket for Focus earlier this week, Will said his wife Jada Pinkett Smith ordered him to get in shape for his steamy scenes with Margot!
Will recalled the moment he informed Jada that Margot was going to be his co-star. Jada said, 'Boy don't embarrass me. Get in shape now'. Will added: "She was like, 'Do not let that girl smash you onscreen.'"
Perhaps the best thing about last night's premiere was that WIll launched into a sing-along of the Fresh Prince of Bel-Air theme tune, and the crowd joined in with delight.
However, Margot was one of the only ones who couldn't join in, as she admitted that she's never watched a single episode of Fresh Prince before!
Focus will be released in the UK on 27 February.
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Watch the official trailer for Focus below: