Hilary Duff and husband Matthew Koma are expecting: 'Surprise Surprise!'

By Angeline Jane Bernabe, Video by Will Linendoll & Brittany Berkowitz

"How I Met Your Father" and "Lizzie McGuire" star Hilary Duff and her husband Matthew Koma are expecting.

The couple announced the news Tuesday on Instagram.

"Surprise Surprise!" Duff captioned a post featuring her family's holiday card, which included sweet images of her kids and Koma.

One side of the holiday card includes the message, "Buckle up Buttercups, we're adding one more to this crazy bunch! The Duff, Bair, Comrie Crew."

Cindy Ord/vf23/Getty Images, FILE

Matthew Koma and Hilary Duff attend the 2023 Vanity Fair Oscar Party Hosted By Radhika Jones at Wallis Annenberg Center for the Performing Arts on March 12, 2023 in Beverly Hills, Calif.

Koma also shared a photo of his family on Instagram.

"Baby #4 is loading…" he captioned the post.

This will be Duff's fourth child and her third with Koma. She shares her eldest son, Luca Cruz, 11, with ex-husband Mike Comrie.

Duff and Koma, who tied the knot in December 2019, welcomed daughter Banks Violet, 5, in 2018, and Mae James, 2, in 2021.