1. Madonna said goodbye to David Letterman by remembering her notorious F-bomb-laden Late Show appearance.
2. While Gwen Stefani said goodbye to Dave by posting a clip from her and No Doubt's very first appearance on the Late Show.
3. Jennifer Aniston shared this early '90s photo of her and friend dressed like a cover of a Laura Ashley catalog.
4. Pitbull took us back to his high school basketball days, when he also had hair.
5. Matthew McConaughey posted this early '00s pic of him and his dog, BJ, traveling the country.
#tbt Me and bj in office on the road
6. Miss Piggy shared this glamour shot of herself on the set of the Muppet Movie.
#TBT - On set of The Muppet Movie, moi's very first feature film!
7. Katherine Heigl looked back on her early '90s teen modeling days.
#TBT Modeling days. The erm... early 1990's "nautical" look??? Apparently... Complete with fake tattoo. Haha! 😉
8. Amy Schumer let everyone know she might have originated the Red Nose Day idea.
Always settin trends #tbt #RedNose