BBC The One Show viewers stunned at Matt Lucas' appearance

Matt Lucas surprised viewers as he made his latest TV appearance. The comedian and TV star sat on The One Show's famous green sofa alongside Jennifer Saunders as they both chatted about their latest projects.

While Ab Fab star Jennifer chatted about appearing in the joyous Sister Act musical alongside Lesley Joseph, Beverley Knight and The Greatest Showman's Keala Settle, Matt had a slightly more serious story to share.

He spoke to hosts Jermaine Jenas and Lauren Laverne about his appearance on the BBC series Who Do You Think You Are, which aired on Thursday night following his One Show stint, and showed his family's unexpected connection to Anne Frank. Matt found out his ancestor had lived with Otto Frank and his family.

READ MORE: Dame Deborah James makes last TV appearance as she continues 'smashing taboos' during end-of-life care

This means that the Little Britain star's ancestor knew Otto’s daughter Anne, one of the most discussed Jewish victims of the Holocaust and whose diary of her family's two years in hiding during the German occupation of the Netherlands became a classic of war literature.

Following a clip, Lauren commented: "My heart was in my mouth watching you take in that information. That’s just one of the things you find out about your grandmother and your wider family story. How are you feeling about it now because it must have taken a while to process?”

Matt, 48, replied: "It’s a tragic story but there is happiness with my grandmother and the life she found. She met my [grandfather] and had two wonderful grandchildren." Matt's mum Diana, who also joined him on the BBC talk show, interjected: "And a wonderful daughter."

"We’re a very modest family," Matt joked before continuing: "But learning