Pregnant Duchess Kate stunned in a long, sparkling blue ball gown at the Royal Variety Performance 2017. Kate, who is pregnant with her third child, was accompanied by Prince William at the London Palladium Theater on Friday. The annual gala is attended by senior members of the British royal family and has taken place since 1912. This year, it featured performances from artists including James Blunt, The Killers, and Seal.