Let's be real, we're still fans well into our adult lives...
Since the Dr. Seuss film was released 17 years ago - and being that it's the holiday season - we decided to see what all our favourite cast members are up to now and how different they look today from back then!
Taylor Momsen (Cindy Lou Who)
We were surprised to learn that Taylor Momsen (Jenny from Gossip Girl) put her acting career on the back-burner to be part of her rock band The Pretty Reckless.
Jim Carrey (The Grinch)
Following his memorable performance in the holiday flick, the iconic actor has since starred in films Bruce Almighty, A Series of Unfortunate Events, Fun with Dick and Jane, Yes Man, and Dumb and Dumber To!
Christine Baranski (Martha May Whovier)
Christine has expanded her acting career a lot since the film with acting credits in movies Chicago, Mamma Mia!, The Bounty Hunter, A Bad Moms Christmas, and more.
Jeffrey Tambor (Mayor Augustus Maywho)
The actor has had a booming career since How the Grinch Stole Christmas with roles in Twenty Good Years, Bent, The Good Wife, Law & Order: Special Victims Unit, China, IL, WordGirl, Archer, Star vs. the Forces of Evil, Arrested Development, and most notably, Transparent.
Molly Shannon (Betty Lou Who)
Molly has made cameos on popular shows Sex and the City, Will & Grace, and Divorce since How the Grinch Stole Christmas.