The couple’s son Milo was born in 2016. In January, Deeley announced that Milo’s sibling would be born in spring.
Wearing a yellow bikini and baring her pregnant stomach in the photo, 41-year-old Deeley wrote in a caption on the Instagram post: “Sunday Funday”.
Deeley, who first found fame on SM:TV Live with Ant and Dec, has been living in the US since 2006 since becoming presenter of the TV dance competition.
She has been nominated for a Primetime Emmy Award on five occasions for her work on the show.
Cat Deeley and Patrick Kielty are expecting their second child together. (Ian West/PA)
Deeley married Northern Irish comic Kielty, 47, in a secret ceremony in Rome in 2012.
