Gabrielle Union remembers Heath Ledger with epic '10 Things I Hate About You' throwback pic

Gabrielle Union took a heartfelt trip down memory lane.

On Throwback Thursday, the 44-year-old actress shared a photo on Instagram from the 1999 teen comedy, 10 Things I Hate About You. In the image, Union is posing with her co-stars Julia Stiles, Joseph Gordon-Levitt, Larisa Oleynik, Andrew Keegan, David Krumholtz and the late Heath Ledger.

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"Just a bunch of kids having the time of our lives up in Tacoma/Seattle," she gushed. "First movie and an experience that I'll never forget."

Union also praised her co-stars in the caption and paid tribute to Ledger, who died in January 2008. "The best/coolest/most generous group of people to share my 1st film experience," she continued. "What a time, man. ❤ and eternal light #RIPHeath #10thingsihateaboutyou #CanYouEverJustBeWhelmed."

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After portraying Chastity Church in 10 Things I Hate About You, Union went on to star in two other epic teen flicks, She's All That and Bring It On.