Fans got more than they bargained for at Billie Eilish's London concert this week. On Tuesday, Eilish performed for a small crowd of 15-hundred people and surprised them with two very special guests. She invited the members of Boygenius on stage to perform "When the Party's Over" and later brought Labrinth up to sing their song "Never Felt So Alone." Before introducing the trio, Eilish reportedly told the crowd to lower their phones so she could see their faces while she introduced the next guest. “I’m in love with all three of them, truly,” she said after Boygenius left the stage. Watch footage of Eilish and Boygenius below and a video of her with Labrinth on X.