The TV shows star Hugh Dennis revealed he's "so very happy" with co-star girlfriend Claire Skinner.
The comedian, 56, and actress, 53, have been in a relationship for more than a year.
Speaking about their romance to the Mail On Sunday, Hugh gushed: "I am very, very happy, we are so very happy.
"It’s nice and yes, it’s so lovely."
A friend of the couple added: "It’s the most wonderful love story, they found one another at the right time in their lives and it’s all rather sweet."
The Mail reports how the couple are living together at Hugh's £1.2million London apartment.
The couple, who play stressed-out parents Pete and Sue Brockman in the show, got together in March last year after their marriages broke down.
A friend said: “It’s always a sad moment when a marriage breaks up. So to have found each other after the ending of both their relationships is rather lovely.”
Pals said 53-year-old Claire, a mum of two, split from TV director Charles 2½ years ago — but kept it quiet and still referred to him as “my husband”.
Hugh has two children with second wife Kate Abbot-Anderson but they separated in 2015 after 19 years together.
The friend added: “They were going through marriage breakdowns at very similar times, but it was quite a while after their separations that they got together last year.
“Between the end of the last series of Outnumbered in 2014 and the Christmas special in 2016, they didn’t actually see each other for two years.
“They’ve always been really friendly but they were living their own lives until they were both single.”
In recent months Hugh and Claire had been spotted together several times but it was assumed they were out as friends.
The pal said: “They’ve been out in public quite a lot, just no one has quite cottoned on to it.”
The pair have been open with relatives, friends and colleagues about their love.