David Walliams' exciting episode of Who Do You Think You Are?, which first aired back in 2020, is set to be reshown on BBC on Monday night - but what about the Britain's Got Talent star's own history? The 50-year-old previously shared a never-before-seen throwback photo of himself as a baby with his grandmother - and he is adorable! READ: Simon Cowell beams as he reunites with BGT gang after confirming engagementSharing the snap ahead of the original airing of the episode, the post read: "David's episode of 'Who Do You Think You Are?' is on BBC One tonight at 9pm. This is David with his grandmother," the caption read.