David Walliams does his best to keep his private life private, but on Wednesday he allowed fans a small glimpse into his "date night".MORE: David Walliams films inside stunning London homeThe Britain's Got Talent judge had headed for a meal with his lookalike mum, Kathleen, and the pair couldn't have looked happier.WATCH: David Walliams films inside London homeDavid looked incredibly dapper in a black suit coat with a red shirt, and red handkerchief, while Kathleen looked elegant in a gorgeous