The couple — engaged since January — were photographed holding hands as they exited The Royal Opera House. The Yoga Hosers actor was on hand to present the Icon Award to musician Iggy Pop during the show.
Depp, 51, rocked a black suit, wore green nail polish and accessorized with blue sunglasses. Heard, 28, stunned in a strapless black dress with lace detail. She added a pop of color with red nails and lips.
The couple last walked a red carpet together at the 2014 Costume Institute Gala in NYC on May 5. The Pirates of the Caribbean: Dead Men Tell No Tales star channeled Mr. Peanut in a tux with tails as he held a black cane. Heard looked glam in a Giambattista Valli Haute Couture gown.
"She's a wonderful girl," Depp gushed about his bride-to-be during an interview with the Today show on April 4. "She's sharp as a tack. A Southern belle and sweet as can be, and very good for me."
Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!