1. Marie Osmond posted this pic of her and a very redheaded Cher hanging out in the early '00s.
.@Cher Still using #makeuptips u taught me. You're the best! Hope🎂was gr8!💋 #TBT #SonnyandCher http://t.co/12vjPntRcS
2. Colin Hanks shared his high school freshman year photo when he was going through his ~rebellious~ grunge phase.
3. Sarah Michelle Gellar paid tribute to Cruel Intentions by posting this photo of herself with the film's writer-director, Roger Kumble.
4. While Amanda Seyfried paid tribute to her Big Love days.
5. Madonna shared this stunning photo taken by her friend the late, Herb Ritts.
6. Super adorable: Eva Longoria as a little girl.
Because this little girl had big dreams #WhyIWork #tbt @WellsFargo #ad
7. John Stamos remembered the time he met Jeff Bridges while dressed in Uncle Jesse drag.
#TBT. Jesse and the Dude.
8. In honor of her 47th birthday, Kylie Minogue posted this sweet baby photo of herself.
9. And finally, Patrick Stewart posted this #tbt of his BFF Ian McKellen in honor of his birthday.
The beautiful man I was a fan of, all those years ago, @IanMcKellen who celebrates his birthday this week. #TBT