The Duke and Duchess of Cambridge were cheered on to the red carpet at the 72nd Baftas in London's Royal Albert Hall.
Kate was dressed in a white one-shouldered Alexander McQueen dress with a floral motif while William wore a black dinner suit.
After the ceremony on Sunday evening, the royal couple met award winners including Olivia Coleman, Rami Malek and Alfonso Cuaron to congratulate them on their success.
The royal couple mingled on stage with the winners, chatting and laughing together while the rest of the audience filed out of the venue.
Prince William, who is the president of Bafta, presented its highest accolade, the Fellowship, to film editor Thelma Schoonmaker.
Presenting the award, he said: "Her work has produced some of the most memorable moments in cinema."
He also discussed Bafta’s work with actors, saying: "Tonight’s nominees are a true testament to Bafta’s dedication to funding and supporting that talent."
Fans who had gathered outside the Royal Albert Hall in central London screamed as the royal couple walked side-by-side into the ceremony on Sunday evening after making the short journey from Kensington Palace.
They were greeted at the entrance by the Royal Albert Hall’s chief executive Craig Hassall before making their way to their seats.
The entire crowd rose to their feet to welcome the royal couple into the ceremony, which was presented by actress Joanna Lumley, and stayed silent as they made their way down to their places in the front row of the auditorium.
They were the last to take their seats and were introduced to the audience by the announcer.
The Duke and Duchess of Cambridge were making a return to the film awards, having attended previous ceremonies together.
The duke has been president of the academy since February 2010.