Pregnant Hilary Duff Laments After Her Baby Belly Grows Out of 'Perfect Vintage Levi's'

Hilary Duff has hit a new milestone in her pregnancy.

The How I Met Your Father star, 36, who is expecting her fourth child, revealed on her Instagram Story that she can no longer fit a pair of her favorite jeans thanks to her growing belly.

She shared a selfie illustrating this, showing her jeans fully unzipped and her protruding belly. In the photo, Duff closes her eyes and leans against a wall while resting a hand on the top of her baby bump. Her other hand holds her phone up to snap a picture. 

“These perfect vintage Levi’s carried me through this pregnancy as long as they could,” she wrote over the photo, adding that she needed “to come for a visit” while tagging clothing store With Love, Lenny. 

Last week, the actress shared a sonogram of the child, whom she is expecting with husband Matthew Koma. The photo showed a closeup of the baby’s face in the sonogram — prompting a crack from Duff about its cute features.

“Little stinker with the cute nose,” she captioned the post.

Duff and Koma announced they were expecting another child on her family Christmas card this year, which she also posted to the social media platform. 

The front of the card displayed a photo of Duff with her hand on her baby bump as she posed in pajamas with husband Koma, 36, their children Banks Violet, 5, and Mae James, 2, and her eldest son Luca Cruz, 11, who she shares with ex-husband Mike Comrie. 

“Surprise, surprise,” Duff wrote in the caption at the time, along with "So much for silent nights. Love, the Duff-Bair-Comrie Crew." 

In the back were individual shots of the kids and the message, "Buckle up Buttercups, we're adding one more to this crazy bunch!" Koma shared another fun family photo from the shoot on his Instagram page and wrote, "baby #4 is loading…"

Following the announcement, she shared another snap of herself lying in bed and showing off her baby bump in a white tank top and revealed that she had “been trying to hide this thing for a minute.” 

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The Lizzie McGuire alum previously shared with PEOPLE after the birth of her third child Mae James that she loves the "mayhem" of having so many children around her home.

"I love when everyone's full of energy and the house is buzzing,” she said. “You never know what the day is going to bring or what your kid's going to say. We're in the thick of it, and it feels good.”