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Russell Brand

David M. Benett/Getty Images

It's a girl!

Russell Brand became a father for the first time to a daughter reportedly named Mabel, according to the Daily Mail. As E! News confirmed on Monday, the comedian and his fiancée Laura Gallacher officially welcomed their first child after an under-the-radar pregnancy.

Gallacher's sister Kirsty Gallacher also confirmed the sex of the baby when she tweeted she was "proud to be an auntie for the first time," but could not meet her until Gallacher was well. 

While the couple has been notably tightlipped about the pregnancy, the actor let the happy birth news slip to an audience Sunday night when he mentioned that he had to run home because of their new bundle of joy. 

Nottingham Playhouse audience member Daniel Crann told The Mirror Brand "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--king M21 as my girlfriend has just had a baby.'" 

While the future husband and wife did not initially announce the pregnancy or the baby's birth, Brand did confirm he was headed for fatherhood when he posted a photo on Instagram of himself reading an expectant dad's handbook. 

"Right then. My Mum bought me this. Time to get ready! #trewlit #bookstagram #parenting," Brand wrote in the caption.

 

Russell Brand, Baby Book

Instagram

As he told Es Magazine in October, he was excitedly preparing for his child's arrival. 

"I feel lit up by the idea. I'm very excited about becoming a dad," he told the publication. "I am just getting ready to be with a new little person and see what it is they want."

While Brand prepared to be a father by painting the baby's room and studying the parenting books, he's not so keen on the idea of labeling his first born. 

"We don't know the gender," he said during an interview on The Jonathan Ross Show before the birth. "I may not even ever impose a gender upon it—let the child grow up and be whatever the hell it is."