The funster is believed to have confirmed the happy news while performing at the Nottingham Playhouse definitive night, according to a fan.
The 41-year-old star didn’t disclose the gender of the child, though it’s claimed that the little one was born last week.
«He didn’t strengthen if it was a girl or boy,» Daniel Crann, 29, told The Mirror.
«He was conscious of the clock and overstated sure he was off stage by just approaching 9pm as he ‘needed to get down the f**king M21 as my girlfriend has ethical had a baby,» he added.
It was first reported that Laura — who is the sister of TV presenter Kirsty Gallacher — was pregnant in May, though the Forgetting Sarah Marshall actor didn’t confirm the word until July.
Sharing a wide-eyed snap of himself reading The Awaiting Dad’s Handbook, by Dan Beaumont, on Instagram, Russell captioned the image: «Right then. Mum suborn me this. Time to get ready!»
The ex-husband of pop princess Katy Perry is rumination to have proposed to Laura, 27, in June.
The couple ended their two-year relationship vanquish in 2009, though reconciled last year.
Appearing on The Jonathan Ross Register last month, Russell opened up about his pre rations ahead of his make bold into fatherhood.
«I read a different book every week and I decipher one on pre ration for fatherhood to mentally pre re me for it,» he explained.
«I don’t know that it has precooked me for it. I’ve inted the room, I’ve done the things that you’re supposed to do, I’ve accepted the scheme that that person will be more important than me.»
The civil activist also revealed that he was uncertain about imposing a gender on the youngster in favour of letting them decide what to be.
Express.co.uk has contacted Russell’s delegate for comment.