Together the TV couple share Rex, five, Rose, three, and Belle, two, while Stacey is mum to sons Zachary, 17, and Leighton, 12, from two previous relationships.
The actor, 77, reprised his role as Gavin's dad, Mick Shipman, for the feature-length festive special on Christmas Day that concluded the BBC series 17 years after it first hit screens.
Gavin and Stacey star Laura Aikman, from London, reveals she 'almost quit' acting for a surprising career. The 39-year-old admitted she once considered baking cakes for farmers markets
The TV presenter, 38, is fronting the new BBC documentary Rape On Trial, which covers the delays to court cases and waiting times for victims of alleged rape and sexual assault.
The Gavin & Stacey star, 46, quietly bought an £11.5million mansion in north west London last year, which is also home to actors Helena Bonham Carter and Tom Hiddleston.
Britain's Got Talent contestant Stacey Leadbetter received a Golden Buzzer from KSI during Saturday's show after being forced to retrain her voice due to a stutter.