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With its modern take on "Pygmalion," a catchy soundtrack featuring Sixpence None the Richer and that infamous group dance number to "Rockafeller Skank," "She's All That" was one of the most memorable teen movies of the 90s.

In honor of star Freddie Prinze Jr.'s 36th birthday today, we're taking a look at how the entire cast has aged since the flick came out in January 1999 ... over 13 years ago!

Freddie, Rachael Leigh Cook, Jodi Lyn O'Keefe, Matthew Lillard, Lil Kim (yes, that Lil Kim!), Usher and more -- see what they looked like back then ... and today!

And be sure to re-watch that prom dance number below:

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