Downs wore a vivid orange leather suit with a ping-pong paddle case, mirroring Chalamet's look, while Stalter donned a floor-length orange gown with cutouts, inspired by Jenner.
The actors playfully suggested they had 'borrowed' the outfits from friends, alluding to Chalamet and Jenner's original ensembles.
Later in the evening, Timothée Chalamet won the Best Actor award for his role in Marty Supreme.
During his acceptance speech, Chalamet publicly thanked Kylie Jenner for their three-year relationship, to which she responded by mouthing 'I love you'.