The 28-year-old American actress looked pretty sharp in a black two-piece suit complete with satin lapels and high-waisted flared trousers. Oh yes, flares are en Vogue (again).
As is the hand-in-pockets thing which Heard mastered last night - it's all about confident elegance and she's got it.
The engaged couple put those relationship-on-the-rocks rumours to rest as they worked the red carpet hand in hand, and we have to say they were very convincing.
While Amber opted for a classic all black ensemble, the perfect cat eye make up and a messy down do - Johnny wore a charcoal grey pinstripe suit by Ralph Lauren Purple label, black tie, burgundy shirt, matching pocket square and biker boots.
Oh and the blue-tinted specs? Classic Johnny.
Mortdecai, adapted from the first installment of the The Mortdecai Trilogy books by Kyril Bonfiglioli, sees Depp play a charming art dealer and also stars Gwyneth Paltrow (though she was absent from last night's premiere), Ewan McGregor, Paul Bettany and Olivia Munn.
Fancy seeing Depp and Gwyn together on the big screen? The film lands in cinemas 23 January.
LOVE MR JOHNNY DEPP? We hear you. Take a look through this gallery to see his style evolution.