William had arrived at the BAFTA Film Awards alone this year, while Kate, 42, is recovering from a recent abdominal surgery.
Prince William congratulates BAFTA winners backstage
STORY: The Royal spoke with winning director Jonathan Glazer and producer James Wilson, who received three BAFTAs for their holocaust film "The Zone of Interest," along with Savanah Leaf - recipient of a BAFTA for debut British writer, director or producer.