The former Liberty X singer teased on Twitter that she is keeping the sex of her first child with husband Hugh Hanley "between family" for the time being.
Heaton added to her followers that she received the news at a "breathtaking" and emotional ultrasound exam today.
"Our 20 wk scan was simply breathtaking," she wrote. "We know what our miracle is-but r keeping it between family for the moment-There were lots of tears!"
Heaton announced her pregnancy on her 32nd birthday - her first wedding anniversary - in July.
The ex-Celebrity Big Brother contestant married Hanley in a ceremony in the Bahamas.