The 31-year-old singer revealed the news while she was performing with her Pop Dungeon Band at Birmingham Pride 2017, reported Mirror.
She proudly showed off her baby bump in a sequinned top and fishnet tights as she performed for the crowd.
This will be Church's third child. The "Crazy Chick" hitmaker is already mother to Ruby Megan Henson, nine, and Dexter Lloyd Henson, eight, who she shares with her ex, Welsh rugby player Gavin Henson.