The couple announced they are expecting a return in March.
They have now confirmed in an Instagram post that their baby girl, Valentina, has been delivered.
“Welcome to the world, beautiful girl – Valentina Willow Drewitt-Barlow x our daughter is almost a month early but she’s perfect,” Barrie said in a video.
He added: “We feel totally blessed x I love you Scott. ”
Congratulations from many of Barrie’s 40,000 Instagram followers poured in.
“Congratulations, she’s just perfect,” one person wrote.
Another added: ‘Barry and Scott she is so beautiful, what exciting news to wake up this morning too, the willow of the world can’t wait to meet her. “
Barrie separated from her husband Tony, 55, after falling in love with Scott.
Last year, he expressed his desire to have daughters with his new partner through a surrogate mother.
Scott was previously in a relationship with his partner’s 20-year-old daughter, Saffron.
In a bizarre twist, the Drewitt-Barlow and Scott all live under one roof.
Barrie and Tony were registered as parents in 1999 and lived in luxury in Florida, USA, having earned millions from their surrogate business.
They had their own child around the same time.
He has had a platonic relationship with Tony since his cancer diagnosis in 2006.
Tony has said he fully supports his former partner’s plans to have children when asked last year.