'Lizzie McGuire' Star Hilary Duff Makes Surprise Pregnancy Announcement!

"Lizzie McGuire" star Hilary Duff has just announced she is pregnant with her fourth child, whom she is expecting with husband Matthew Koma! 

The actress took to social media to share a photo of this year's family Christmas card, with the caption "Surprise Surprise!" If fans look closely, they will notice Duff is holding her stomach as she shows off her baby bump.

On the back of the card, the Duff Family wrote, "Buckle up buttercups, we're adding one more to this crazy bunch!"

Hilary Duff is already mom to Luca, 11, who she co-parents with ex-husband Mike Comrie.

She is also a mom to her and Matthew's daughters Banks, 5, and Mae, 2. She rose to fame when she starred as Lizzie McGuire in Disney Channel’s hit television series, “Lizzie McGuire” from 2001-2004 and in “The Lizzie McGuire Movie” in 2003.

Duff has since gone on to star in hit shows such as "Younger" and "How I Met Your Father." She is 36 years of age.

Fans instantly flooded the comments section, congratulating the actress. "I knew she was going to have another! I felt it! Congratulations!" one fan wrote.

Another said, "Aw!!! Congratulations!!!. Hope you are feeling well."

While one fan hilariously said, "Congratulations!!! I’m one of four siblings… I wish you all luck, but also know- it’s so fun having a built-in friend group!"

As one fan claims they knew it all along, writing, "Ahh!!! I knew it!! All the belly-covering photos, and you are glowing!!"

"Hilary Duff is unstoppable!!" another said.

This announcement comes just a few days after Duff found out about the passing of Stan Rogow, who was the writer and Emmy-nominated producer of “Lizzie McGuire.”

“Writing this right now is bringing back so many distant memories of what feels like a completely different time..,” she began, adding, “One where I had absolutely no clue where I was heading or how I was getting there, but where I had that eagerness and blind optimism that accompanies youth and your first opportunities to step up.”

Duff continued, “You heavily cherish the people who first believe and see something in you, and for me, there was a very special person who fought for me to land a role that would change the entire course of my life… and I’m so very sad to hear of his passing today.”

He passed away at UCLA Medical Center in Los Angeles at the age of 75.

This pregnancy announcement also comes days after the actress contributed a social media post to her daughter, Banks.

"Banks- the sweet/spice/dancing butterfly of our family!" Hilary captioned her October 25 Instagram tribute. "5 years of memories with you are burned on my heart and soul forever and begging for more! You are all the top ingredients! Whimsical, yet practical. Smart-clever-cautious, yet free! Thanks for being ours and for being weird and princessy all in one glorious package!!!"

"Gosh I love you so much!" she continued. "To the best big and little sister there ever was! Happy 5 my little cherry bomb ! I sure hope the next 5 go by a little slower, all the cuddles, tickles, Taylor Swift, brainteasers, treats and trampoline bounces 4life my queen."

Congratulations to the Duff Family!