1.Lupita Nyong'o shared this sweet photo of herself and co-star Chadwick Boseman taken on the set of Black Panther.
2.Paul McCartney paid tribute to the late British comedian and fellow Liverpudlian, Ken Dodd, by posting this photo of the two of them (along with his fellow Beatles) hanging out together in the early '60s.
3.Halle Berry (right) shared this adorable photo of herself and her older sister, Heidi, in the late '60s.
4.Dolly Parton posted this dazzling and shimmery '80s pic.
5.Gus Kenworthy thirst-trapped for his #TBT.
6.Janet Jackson remembered her 2017 State of the World Tour.
7.Kevin Costner shared his 1990 Rolling Stone cover.
8.Mark Ballas posted this oh-so-cute baby photo.
9.Naomi Campbell shared this early modeling pic — proving she's been serving fierceness since she was a teenager.
10.Blondie posted this photo of Debbie Harry hanging out with fellow rock stars/icons Chrissie Hynde of The Pretenders, Pauline Black of The Selecter, Viv Albertine of The Slits, Siouxsie Sioux of Siouxsie and the Banshees, and Poly Styrene of X-Ray Spex in 1980.
11.Nina Dobrev remembered when she both saw Hamilton for the first time and got to hangout with Lin-Manuel Miranda.
12.Cindy Crawford posted this clip of when she learned how to box for MTV's House of Style in the early '90s.
13.Sterling K. Brown threw it back to this past weekend, when he hosted SNL.
14.In honor of Mother's Day in the UK, The Royal Family shared this photo of Queen Elizabeth alongside her kids and Prince Philip, in 1965.
15.And finally, Armie Hammer posted his mug shot from when he got arrested for pot possession in Texas in 2011.