The actor, 50, is usually the star of the show on red carpets, but on Wednesday he was at L.A.'s Arclight Theatre to support his fiancée, Amber Heard, at the premiere of her new film, 3 Days to Kill.
Far from being shy, the couple engaged in some PDA, as Depp stole a kiss from his bride-to-be before they headed inside for the screening.
Both were strikingly dressed, too, with Heard, 27, looking gorgeous in a long-sleeve dress with a deep neckline and high slit, and Depp quite dapper in a navy three-piece suit and hat.
Kevin Costner, Heard's costar in the film, told PEOPLE of the happy couple: "We can't get in the way of love. And that's what they found. How lucky for them!"
And how was working with Amber? "She was great," said Costner, 59. "She had a very exotic role. She's a person who has herself together. Playing an outlandish character – it was not easy for her to find her footing. But we did our job as actors, which was trying to look out for each other."