1. Rob Lowe looked back on the awesome mullet (?) he rocked in St. Elmo's Fire.
2. Mandy Moore gave us a peek at her first headshot.
3. Kellan Lutz took a swipe at Justin Bieber by posting a photo from his Calvin Klein Underwear modeling days.
We think Kellan wore them better. Who agrees? -Team Lutz #ThrowbackThursday #MyCalvins
4. Paul McCartney reminded us of the hideous fashions of the early '90s.
5. Speaking of hideous fashions, Magic Johnson bravely shared this photo of himself wearing leather pants while hanging out with Oprah.
Check out @Oprah and I hanging out back in the day! I must say, I was looking good in those brown leather pants! #TBT
6. Super cute: Katherine Heigl hugging her mom on the set of a photo shoot for Seventeen magazine.
#TBT With my mom at our Seventeen magazine shoot! Way back when.
7. Barbra Streisand shared this photo of herself hanging out with Quincy Jones and Ella Fitzgerald.
8. Colton Haynes took us back to his high school days when he wore Abercrombie & Fitch.
9. And finally, Sir Ian McKellen took us back to the year 2000, when he filmed the Lord of the Rings films.
TBT May 2000 during filming LOTR. "Has anyone seen signs of a small, slimy creature around here?" — at Mt. Ruapehu.