"SURPRISE!!! I’ve been trying to contain this excitement for a loooong time while this has been in the works!" she wrote. "I am beyond excited to be home again, back with my girl... and into her 30s #bringbackbutterflyclips."
Bring back the butterfly clips, indeed.
The series will pick up with Lizzie trying to navigate New York working as an apprentice to an interior designer. But juggling a new job with her personal life is proving tricky and just like the rest of the millennial circuit, she's craving change.
"She’s not going to stay in Brooklyn too long, actually. That's where she's been, but she’ll be coming back to Los Angeles," the 32-year-old revealed in a recent interview with Vulture. "She's forced out of New York. She’s like, 'I can't be here anymore.'"
Who will star in the Lizzie McGuire reboot?
After weeks of speculation, Duff finally teased further details from the reboot with a photograph of the McGuire family reunited in what will become their living room set.
Alongside the nostalgia-inducing snap of the foursome beaming at the camera, she wrote: "We are standing in what will soon be the McGuire living room. What’s up fam. We doing this."
Of course, that means Hallie Todd (Jo McGuire), Jake Thomas (Matt McGuire), and Robert Carradine (Sam McGuire) will all return to their previous roles.
Duff pleased fans across the globe after revealing that Adam Lamberg (Gordo, to you and I) will also reprise his role for the show.
Teasing the news, she posted a photograph of the reunited duo alongside the caption: "I feels so basic saying something that’s been shouted at me almost my whole life buuuut... hey now, hey now."
Understandably, the snap soon garnered over one million likes within a mere two hours.
Rumour has it, Ethan Craft (played by Clayton Snyder) will also make an appearance. In a recent interview, Duff admitted that Lizzie may well reunite with her high school crush.
"He is hot. He's very hot," the actress revealed. "I'm pretty sure there's going to be, there's going to be a thing."
But what about Gordo? Duff is staying tight-lipped on the subject.
"I feel like them not being together is what was so good... It's that one person that you're like, 'Was he the one? Is it ever going to be?'" she said. "You're always kind of wondering. We wanted it to hurt everyone a little bit, and it'll continue to hurt."
Erm, not quite the response we were keeping our fingers (and toes) crossed for.
Where is the Lizzie McGuire reboot being filmed?
According to Duff's Instagram page, filming for the project is well underway with scenes unfolding in New York.
We have our first clip!
Although admittedly, it is quite short, Disney+ has finally given us a little glimpse of the new series! Placed at the end of a new 2020 promo video for the streaming channel, we see Hillary Duff as Lizzie, grinning widely and saying breathlessly, "It's me."
What does Lizzie McGuire look like now?
Although the series is no longer set in the early noughties, that doesn't mean Lizzie has completely forgotten her fashion roots.
Despite swapping chokers and slogan tees for a workwear wardrobe we wouldn't half mind borrowing from, she took to Instagram to prove there will still be some pretty covetable throwback moments.
In one snap, the actress can be seen wearing silver hair beads woven through her blonde locks which were freshly dyed ahead of her return to the now-iconic role.
Celebrity hair stylist Nikki Lee is behind the look and even shared top tips on how to recreate the aesthetic via Instagram.
"Never in a million years did I think I would be doing Lizzie's colour! Well dreams do come true!" she wrote. "Thank you @hilaryduff for trusting me to create the perfect blonde for the next chapter of Lizzie McGuire! And thank you @joico for helping my creativity flow effortlessly!"
What has Hilary Duff said about reprising her most famous role?
During an interview with US Elle, the actress opened up about reprising the role of Lizzie and spoke about how much the character means to fans.
"It sounds so cheesy to say, but it really warms my heart," she said. "This character has meant so much to so many people. I've known that throughout the years, people constantly coming up to me like, 'Oh my God, you were my childhood', and 'You were my best friend.'"
"She really was a key element to kids in their preteen years, and those are very special, scary times."
How can I watch the Lizzie McGuire reboot?
The Lizzie McGuire reboot will air on streaming platform Disney+ which will launch on November 12 in the US.
The premiere date hasn't been announced yet but filming is well underway so expect a 2020 release date.
We'll be the first to let you know of any updates too of course.