Ora called the meeting "Date night" on her social media accounts, tagging McGregor. She also posted several pictures with McGregor, who had his arm around her at the Royal Albert Hall.
McGregor's long-term girlfriend Dee Devlin was not in any of the photos. The couple had a child, Conor Jack McGregor, in May.
Ora also posted a photo with Donatelle Versace.
"Last night with my real date," Ora tweeted.
Ora performed George Michael's Freedom at the gathering.
"I was asked to sing Freedom George Michale at the royal Albert Hall for one of my idols and inspirations Donatella Versace," Ora wrote on Instagram. "Thank you for being you and letting me rock this fly [expletive] suit whilst signing a song that means so much to you and your brother Gianni. Congratulations on winning the Icon Award, you deserve that and the world. I love you."
McGregor appreciated the history behind the Royal Albert Hall.
"In the Royal Albert Hall in awe of the positivity that surrounded the British Fashion Awards," McGregor wrote on Instagram. "It's people, and the entire show, while also thinking at the same time that if you strip away the red carpets and the diamond lights this building is littered in true battle that goes way back!" "You can trace this building way back to famous bare knuckle contests that shaped the entire fight game as it stands today!"
McGregor posted a message on his Instagram on Tuesday, saying: "stay out me [expletive] way." The photo on the post pictures McGregor stepping into a car and leaving the event.