Conor McGregor mingled with a lot of huge celebs at London's Fashion Awards on Monday night -- including Rita Ora, who shared photos of her and the UFC mega-star with the caption: "Date night."
Date night @TheNotoriousMMA pic.twitter.com/G4gR5KJ11Y
The Irish fighter and British pop singer were hangin' for most of the ceremony ... seated together at a table with F1 superstar Lewis Hamilton and supermodels Irina Shayk and Jourdan Dunn.
Before you freak out -- Conor just had a kid with longtime girlfriend Dee Devlin ... and Rita's rumored to be dating musician Andrew Watt.
Still ... that didn't stop the haters from coming after Ora -- including Conor's BFF Artem Lobov, who said, "Sorry Rita, burgers are nice but not when a man has steak at home."