TEEN Mom Chelsea Houska's daughter has looked so different and grown up in a new photo on her 13th birthday, floored fans said.

Many commented that they couldn't even believe it was her.

Aubree, now 13, served as the muse of Chelsea, 31, in a new Instagram photo on September 7th.

"My music loving, sassy, funny, Harry Styles obsessed girl is a TEENAGER," the MTV alum captioned the celebratory snap.

Aubree stared down the camera with a new style, wearing a patterned tee tucked into stonewashed jeans, a middle part, and turqoise jewerly.

The desert served as the backdrop as the tween looked so edgy and different with a tote bag too.

Fans were stunned as one commented: "That’s not Aubree!!!

"Is that Aubree????????? Omgggg," wrote another.

"Oh my goodness, so grown up! She’s so pretty," wrote a third.

"No way!!!! I literally didn’t even recognize her!! Happy birthday Aubree!!" exclaimed a fourth.

As a fifth expressed: "Wow. Crazy that so many of us have watched her grow from birth till now. Aubree, you are beautiful."

Chelsea and her husband are set to star in a new six-episode HGTV series with the working title Farmhouse Fabulous this year.

Chelsea shares Aubree with her ex Adam Lind.

She also has three kids - son Watson, five, daughter Layne, three, and daughter Walker, one - with her husband Cole DeBoer.

Chelsea and Aubree are on tense terms with her baby daddy Adam, who has faced a number of legal issues over the years.

There is a warrant out for his arrest due to unpaid child support for Aubree in March 2021.

As of last year, Adam is allowed supervised visitation with Aubree at a government center.

However, he did not show up to the scheduled meetings when Chelsea was starring on Teen Mom 2. 

He is also able to get lunch with Aubree at her school with his mother on Wednesdays, while the preteen stays with Adam’s mother one weekend of the month.

Adam is not allowed to be at home when his daughter is present.

Meanwhile, Chelsea has been slammed for her parenting skills in recent months involving her tween daughter.

Last week, Aubree looked overjoyed as Chelsea teaches her how to put on a "natural seventh-grade makeup look."

Chelsea skipped any foundation or concealer for Aubree and went straight for the blush.

Her natural makeup look also includes eyebrow gel, highlighter, eyeliner, mascara and lip liner.

The daughter expressed how she looked "so much older" with the makeup and some fans loved it - others not so much.

One critic replied: "Aubree is adorable, but is makeup necessary for 7th grade, or is that high school for her area?"

Another defended: "It sounds like Aubree asked to go to Ulta and is interested in makeup. How is that a bad thing?"

Also in the same TikTok, Chelsea was slammed for putting a filter over Aubree's face.

On this point one fan wrote on Reddit: "I hate seeing filters on kids."

Just the week before, Chelsea was slammed for letting Aubree eat messy food on her pristine white couch.

She posted a snap of the preteen tucking into a fancy sushi spread, complete with soy and other sauces on the pricy furniture's ottoman.

One concerned fan wrote: "That makes me crazy nervous with the color of the couch. That better be scotch guarded."

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