The Titanic star, 49, matched her tailored outfit with black suede stilettos at the 15th annual Governors Awards and Ball in Los Angeles.
Since she became a household name in the 1997 blockbuster with Leonardo DiCaprio, Kate's other film hits have included The Reader, which won her an Oscar, and this year's Lee.
The Academy of Motion Picture Arts and Sciences' Governors event, at the Ray Dolby Ballroom, handed out honorary Oscars to Black Panther actress Angela Bassett, 66, and veteran film-maker and comedian Mel Brooks, 98.
It also honoured late music legend Quincy Jones, James Bond producer half-siblings Barbara Broccoli and Michael G Wilson plus Love Actually creator Richard Curtis.
The festive film favourite's Hugh Grant, 64, had the crowd in stitches with deadpan praise for Curtis, 68, who co-founded the Comic Relief charity.
He said: "A man who has taught us that love is all around...but so unfortunately, is his ceaseless altruism. While the rest of us sip cocktails...he's raising millions for those in need. Congratulations, you utter b*****d!"
Other A-list arrivals included pregnant Hunger Games actress Jennifer Lawrence, 34, Jude Law, 51, and Tomb Raider star Angelina Jolie, 49, who wore a gold gown, with son Knox, 16.
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