Throwback Thursday is the day of the week when we come together to celebrate the past. From photos of our childhood vacations to pics of last night's dinner, we've all got a snapshot or two to share from back when. Celebrities have their own memories to share, of course, and hit social media wielding the 'TBT' hashtag. We've collected this week's best throwback photos from some of your favorite stars. Check 'em out below!

Kourtney Karadashian claims she had this stylish cut before Dora from the cartoon 'Dora the Explorer.' (But who pulls it off better?)

Little Justin Timberlake is up at bat!

Kevin McHale loved his vacation to Italy so much he's throwin' us back to it.

Melissa Joan Hart got her very first tattoo all the way back in 1998.

Diddy shared an oldie with Missy Elliott and the late Aaliyah. He wrote, "#RIPbabygirl."

Laura Welsh took over Island Records' Instagram today and shared this #TBT to a trip to Paris.

Nina Dobrev reminisced over the time she entered a mud run. It looks so messy, but really rewarding!

Andrea Barber (aka Kimmy Gibbler from 'Full House') shared an oldie of her and Candace Cameron Bure (D.J. Tanner) making funny faces at the camera.