Hilary Duff Shares Pregnancy Update: 'Been Trying to Hide This Thing for a Minute'

The singer announced she's expecting her fourth baby — her third with husband Matthew Koma — on Tuesday

Hilary Duff is bumping along nicely!

After revealing that she is expecting her fourth baby, her third with husband Matthew Koma, the singer 36, shared the first look at her growing bump on her Instagram Story Tuesday.

Duff’s post, which came just hours after her pregnancy announcement, featured a selfie of her lying in bed and showing off her baby bump in a white tank top.

“Been trying to hide this thing for a minute,” she captioned the shot.

The Lizzie McGuire alum previously shared that she and Koma were further expanding their brood with a snap of her family's holiday card on Instagram.

Related: All About Hilary Duff's 3 Kids (and Baby on the Way!)

In the card's photo, Duff can be seen posing with her three kids and Koma in a bedroom as they all wear pajamas. She has one hand on her baby bump while pulling a shocked face as her husband sits on the bed with one eyebrow raised.

Meanwhile, their 4-year-old daughter Banks hangs from the bed and 2½-year-old daughter Mae sits on the ground with a guitar. Son Luca, 11, who Duff shares with ex-husband Mike Comrie, can be seen sitting in an armchair with a video game controller.

"So much for silent nights," the front of the card reads. "Love, the Duff-Bair-Comrie Crew."

Related: Hilary Duff Enjoys Thanksgiving with Her Family Making Memories and Cooking with Her Three Kids

Duff also revealed the back of the card, which read, "Happy Holidays. Buckle up Buttercups, we're adding one more to this crazy bunch!" and featured solo shots of her three children.

“Surprise Surprise!” the How I Met Your Father star captioned the announcement post.

Following her exciting news, Duff was flooded with congratulations from her celebrity friends, including her Cheaper by the Dozen costar Alyson Stoner.

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“❤️❤️❤️❤️❤️ just 8 more to complete the pack,” wrote Stoner in the comments section.

“Ahh Congrats you guys! ❤️,” added Lucy Hale, while Elle Fanning wrote, “❤️❤️❤️❤️❤️ woohoooo.”

Mandy Moore added, “Love this. What a cute card!! ❤️.”

The happy news was also shared by Koma on his own Instagram. The singer and record producer reposted the family’s holiday photo with the caption, "Baby #4 is loading..." He also tagged the location of the picture as "Vasectomy Clinic."

In an interview with PEOPLE in 2021, Duff praised Koma, whom she married in 2019, as a father.

"He was such an amazing dad right out the gate," she said. "In this time of breastfeeding and craziness, he was like, 'I'm just going to be your assistant because I think that's how I'm going to be the most help to you in this timeframe.' He has this really amazing way of looking at the big picture where I'm very much like, right-here-right-now — and he zooms out."

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