An audience member told The Mirrorthat the 41-year-old Get Him to the Greek star shared that his fiancée, Laura Gallacher, had given birth before exiting the stage.
"He didn't confirm if it was a girl or a boy,” the fan told the U.K. newspaper. “He was conscious of the clock and made sure he was off stage by just approaching 9 p.m. as he 'needed to get down the f***ing M21 as my girlfriend has just had a baby.'"
The newspaper also reported that the baby arrived last week and that a fan had congratulated the entertainer on a “baby girl.”
Brand confirmed rumors of Gallacher’s pregnancy in July, posting a photo on Instagram showing him reading The Expectant Dad’s Handbook.
He recently shared his excitement about parenthood during an interview with ES Magazine.
"I feel lit up by the idea," Brand told the U.K. outlet. "I'm very excited about becoming a dad and I'm preparing myself. I am just getting ready to be with a new little person and see what it is they want."
See more on what the British star had to say about becoming a dad in the video below.