'Kim Possible' premiered 15 years ago -- and fans are freaking out over a new photo of Christy Carlson Romano

She's not a teen anymore, but she could easily pass for one!

Disney Channel's "Kim Possible" premiered 15 years ago today, starring Christy Carlson Romano as the titular teen superhero. She voiced the kick-butt redheaded cheerleader, but her real-life face was well known to fans since she also starred in "Even Stevens," which hit the air in 2000.

In celebration of the big milestone, Romano, now 33, tweeted a celebratory photo that instantly went viral -- because she hasn't aged a day!

"Feeling nostalgic..." she wrote alongside the picture, which shows her flashing a 1 and 5 with her hands.

Impressed by Romano's age-defying genes, many fans urged her to take advantage of her forever-teenage face by heading back to Disney Channel: "Sis, you haven't aged a day so we can pretend it's 15 years ago and you can give us another season," one wrote. The tweet has since been retweeted more than 15,000 times

If Romano does ever make a return to Disney Channel, it likely won't be anytime too soon: The star gave birth to her first child, a daughter, in December 2016. She often shares photos of her little bundle of joy on her Instagram.

RELATED: Celebrities who turned down Disney roles

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Stars Who Turned Down Disney Roles
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Stars Who Turned Down Disney Roles
Reese Witherspoon had agreed to voice Merida in Disney's "Brave" -- but there was one key issue. According to Reese herself, she had trouble mastering the character's Scottish accent: "I tried to do a Scottish accent once. It was bad. I had to quit the movie."
Before agreeing to play Belle in "Beauty and the Beast," Emma Watson turned down the opportunity to play Cinderella in the live-action remake: "When they offered me Belle, I just felt the character resonated with me so much more than Cinderella did," she said.
Is your favorite Disney Channel film "Hocus Pocus"? Well, the classic DCOM almost looked much more handsome: Leo was approached to play the role of Max, offering him "more money than I ever dreamed of," but he walked away. "I don't know where I got the nerve," he later said.
"Hannah Montana" without Miley Cyrus? It almost happened! Singer JoJo was offered the lead role by Disney executives, but she turned it down, later revealing she had "no regrets at all" about rejecting the opportunity.
Warren Beatty was offered the part of Iago, villain Jafar's saucy parrot sidekick in "Aladdin." After he turned it down, Gilbert Gottfried landed the role -- although he first had to beat out Joe Pesci and Danny DeVito, he revealed.
Annnd sometimes you kick yourself later. Billy Crystal has said that turning down a role in "Toy Story" during its early development stage is "one of the only regrets I have in the business of something I passed on." He later took the lead role of Mike Wazowski in "Monsters, Inc."
In 2015, Variety officially announced that Moretz would play Ariel in Disney's live-action "The Little Mermaid." However, a year later, Moretz announced that she had pulled the plug not only on that film, but also on all others she was committed to. "I want to reassess who I am and find myself within my roles again," she explained.
Elle Fanning also turned down Disney's offer to star in "The Little Mermaid." She did, however, agree to play Aurora in "Malficent."
Michael Shannon was reportedly approached to do a major Disney blockbuster, but he wasn't interested at all. Although he wouldn't confirm the film, he gave this cryptic explanation: "They called me recently about some iteration -- I won't say -- but some version of a movie that's been made already countless times. They were gonna give me a lot of money, but I was like, nah. Big movie, too. But I have to think it's an interesting story. If I don't, I can't do it."
The director of "Monsters, Inc," Pete Docter, was dying to slate Bill Murray as monster Sulley alongside Billy Crystal. But after doing a screen read for the part, Murray refused to answer the phone when the director repeatedly called. "We took that to mean no," Docter said.
No thanks! Although she hit it big on Disney Channel's "Wizards of Waverly Place," Gomez declined the leading role in its hit movie-musical "Camp Rock." She also turned down a part in "High School Musical 3: Senior Year."
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