The actor won the award for Best Supporting Actor for his role as Cliff Booth in Quentin Tarantino’s tribute to the 1960s film industry, Once Upon a Time in Hollywood.
However, he was unable to fly over due to “family obligations”, which left Robbie with the task of reading out a speech that referenced Brexit and Prince Harry.
His co-star Margot Robbie graced the stage instead, reading from a piece of paper: “Hey Britain! I heard you just became single, welcome to the club.”
Robbie then read out a joke referencing Prince Harry and Meghan Markle’s decision to relinquish their duties as senior members of the royal family.
Pitt said he planned to name the award “Harry” as “he’s really excited about bringing this back to the States with him”.
Her joke drew laughs from the Duke and Duchess of Cambridge, who were sat in the front row.
The speech went on to thank the cast and crew. He included an extended thank you to Tarantino himself, which Robbie joked was “a bit much, really”.
Not all of the evening's jokes went down so well. Emilia Clarke, Asa Butterfield and Gillian Anderson all fell victim to the autocue scriptwriter with misfired quips.
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