Rewind·Posted on Apr 25, 201411 Celebrity #TBT Photos You May Have Missed This WeekFrom Britney Spears having a blast at Six Flags, to Joey Fatone hanging with Rachael Leigh Cook, they’re all in this week’s #ThrowbackThursday roundup.by Brian GalindoBuzzFeed StaffLinkFacebookPinterestTwitterMail 1. Cute: Britney Spears and her brother, Bryan, hanging at Six Flags. View this photo on Instagram 2. This photo of DJ Jazzy Jeff, Elvira, and Will Smith, is PERFECTION. Elvira @TheRealElvira #TBT #throwbackthursday with Will Smith and @djjazzyjeff215 05:17 PM - 24 Apr 2014 Reply Retweet Favorite 3. Of course Ozzy Osbourne rocked some serious '70s rockstar hair. Ozzy Osbourne @OzzyOsbourne #TBT - Ozzy and Geezer at @HollywoodBowl soundcheck in 1972! Returning for 1st time Sat! http://t.co/OE8U7J88vT - 11:37 PM - 24 Apr 2014 Reply Retweet Favorite 4. Awwww, Gwen Stefani in her Easter dress. View this photo on Instagram 5. Awesomeness: John Stamos hanging with the legendary Walter Matthau. John Stamos @JohnStamos I've worked with some greats- but this guy was the kindest, most intellectual comedic genius ever. #TBT 09:26 PM - 24 Apr 2014 Reply Retweet Favorite 6. Busy Philipps had the quintessential '80s girl bedroom. Busy Philipps @Busyphilipps25 #tbt Birdie told me I look like I could have been friends with DJ Tanner. She is so right. 11:52 PM - 24 Apr 2014 Reply Retweet Favorite 7. FYI: Before she was a vampire slayer, Sarah Michelle Gellar was a cute witch. Sarah Michelle @RealSMG .@DJCassidy here's a great #tbt. Recognize the duck??? 06:35 PM - 24 Apr 2014 Reply Retweet Favorite 8. Wait, was Jimmy Kimmel almost a piano prodigy? Jimmy Kimmel Live @JimmyKimmelLive Jimmy with his cousins Sally and Micki in Brooklyn, NY – 1974. #ThrowbackThursday #TBT 09:20 PM - 24 Apr 2014 Reply Retweet Favorite 9. Joey Fatone and Rachael Leigh Cook looked they were having a fun night out. Joey Fatone @realjoeyfatone @RachaelLCook my friend found this putting it up for #tbt 01:17 AM - 25 Apr 2014 Reply Retweet Favorite 10. Whoa! Anderson Cooper looks almost unrecognizable without his trademark silver-colored hair. View this photo on Instagram 11. And finally, People magazine's most beautiful person in the world (YAAASS), Lupita Nyong'o, shared her adorable baby photo. View this photo on Instagram