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Julia Stiles celebrates her 31st birthday today -- and to celebrate, we're taking a look back at her big breakthrough movie, "10 Things I Hate About You."

The 1999 flick featured a cast of up-and-coming actors, including Stiles, then-unknown Heath Ledger, Joseph Gordon-Levitt and former "The Secret World of Alex Mack" star Larisa Oleynik.

While Heath sadly passed away in 2008, the rest of the cast kept working through the years.

See what happened to all the film's stars since 1999 -- and what they look like now!

Re-watch our favorite scene below: