These four stars were famous well before the start of the hit CW series, in fact, they were famous before the new millennium. Maybe you already know some of them were famous, or you do not recognize any of them from any other show or movie. Either way, everyone likes a good #tbt. Am I right??? We'll go from youngest to oldest...

1. Cole Sprouse

Many remember the Sprouse twins from their hit Disney Channel series, "The Suite Life of Zack and Cody" and then the spinoff "The Suite Life on Deck." However, they starred in the hit movie "Big Daddy" alongside Adam Sandler in 1999. The film is still beloved by many and has famous one-liners if you have not seen it, check it out on Netflix. They also played Ross Geller's son on the infamous TV show "Friends." Before he had dark hair and dressed like Judd Nelson in "The Breakfast Club," on "Riverdale," he was a little blonde cutie.

2. Skeet Ulrich

Before he was F.P. Jones, he starred as Billy Loomis in "Scream" back in 1996. Let me tell you, if you have seen this movie, you can never forget his character. He is a very good actor and plays the sleazy, slimy, and mysterious characters exceptionally well. Also, enjoy the incredibly 90s haircut.

3. Molly Ringwald

Her big break came when she was a member of the brat pack and starred in many 80s flicks. I think my favorite being "Sixteen Candles," she captured the hearts of the misunderstood. I love her and her red hair. She played Shailene Woodley's mom and now she is Archie Andrews's mom.

4. Luke Perry

Before he was Fred Andrews, he was a heartthrob on "Beverly Hills 90210." He was even mentioned in "Clueless" as Dionne puts it "Cher is saving herself for Luke Perry." He was a stud back in the day...

So, did some of these actors surprise you?

I bet season two will have even more...