Today might be Transformation Tuesday, but tomorrow marks the 15-year anniversary of the premiere of the Disney Channel Original Movie, Cadet Kelly.

The film follows Kelly Collins, who is forced to move upstate with her mom and stepfather. She must attend George Washington Military Academy, the school where her stepfather just became the Commandant. After having to leave her friends and everything she's ever known behind, Kelly is faced with difficult decisions. She is bullied by the Cadet Captain and has a crush on a boy who is totally off limits. In the end, Kelly finally learns her way.

Disney Channel stars Hilary Duff and Christy Carlson Romano had the lead roles and seriously nailed it. However, the girls and the rest of the cast have changed so much since their Cadet Kelly days. The transformation is seriously shocking, and we can't get over how young all of the characters looked 15 years ago compared to what they look like now!

Be prepared to have your jaw hit the floor.

Click through the gallery and check out some of the craziest then-and-now photos of the cast of Cadet Kelly!