Professional dancer Anton, 50, shared the couple's double baby announcement via Twitter, saying: "Hannah and I are delighted to announce that we are expecting twins in the spring. We are over the moon!"
Alongside his announcement was a picture of a top hat, cane and two pairs of dancing shows. The caption read: "We hear the tippety tap of tiny feet!"
Anton has been dating Hannah, 41, a telecoms exec, for six years. Last year, he told The Mirror: "I love her above all things. We're very happy."
The pro dancer has been part of Strictly since its very first season back in 2004. He's been widely tipped as a possible replacement for head judge Len Goodman, who has announced he's stepping down after the current season.
Anton was teamed with Birds of a Feather actress Lesley Joseph in the current series. They were eliminated in 11th place in week five.
As you'd expect, popular Anton has been flooded with messages of congratulations from fellow dancing pros, celebrities and former Strictly contestants including Judy Murray, Laura Whitmore, Kristina Rihanoff and Gabby Logan.