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Hilary Duff is getting that knot tied! 

And if you thought she was already married — you’re not alone. 

But the former Disney star revealed on Thursday that she is engaged to her longtime musician lover Matthew Koma. 

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Hilary took to Instagram to share the big news with her fans, writing, "He asked me to be his wife," adding a heart emoji. 

The adorable couple smiled big for the photo as Duff showed off her new diamond(s). 

According to Ira Weissman, founder of The Diamond Pro, the ring features a cushion cut solitaire diamond that appears to be around five or six carats, costing upwards of $200,000. 

"Matthew really wanted to throw Hilary off guard and wanted it to be a complete surprise," a close source told E!. 

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"She had no idea it was coming."

"Matthew wanted it to be meaningful, but casual because he knows Hilary wasn’t dying to get engaged," the source explained. 

"She knew it was important to him and he wanted to propose to signify them being a family unit." 

Matthew popped the question in New York City on a rooftop bar after the Younger star had wrapped up a night of filming. 

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Matthew and Hilary made their debut as a couple on the red carpet back in January of 2017. 

But more importantly — they become Instagram official the following month during their romantic Valentine’s Day vacay in Costa Rica. 

Hilary’s beau started out in the music industry when he released his first EP, "Parachute" in 2012. 

And he’s only been killing it since. 

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He’s been featured on Zedd’s "Spectrum" and Flux Pavilion’s "Emotional" AND he’s even toured with some of music’s biggest names — Ellie Goulding and LMFAO, to name a few. 

Even though they are ~super~ recently engaged, the two have been pretty serious for a while now.

Last Fall, Matthew and Hilary welcomed their first child together, daughter Banks, making them a family of four, including Duff’s first son, Luca. 

Luca comes from her first marriage with Mike Comrie — a professional Canadian hockey player. 

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Hilary often dubs her new fam the "wolf pack," and yeah — they’re pretty much the cutest and happiest little fam possibly ever. 

While a future engagement was not on Hilary’s mind (she claims), she always knew she would "be with Matthew forever and having Banks sealed the deal," the source added. 

"She’s really happy and excited." 

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"Everyone in Hilary’s family has always loved him and seeing him be a dad to Banks now has only made their relationship stronger." 

And nearly two years after the two stepped out publicly for the first time, Koma asked Lizzie McGuire — I mean Hilary — to marry him. 

Congrats you two! (especially you, Matthew.)