Happy Thursday! We're celebrating the (almost) end of the week by kicking it old school with some of our favorite stars. We've gathered up some of the cutest and most sentimental Throwback Thursday pics stars shared this week. From on-set snaps to childhood memories, this week's photos span the full #TBT spectrum.

Ready to get your nostalgia on? You can check out all of the photos below!

Ashley Tisdale shared a snap from her upcoming show 'Buzzy's.'

Sam Smith gave us a glimpse at his last day of school.

Michelle Trachtenberg shared a sweet snap of her and Christina Aguilera.

Timeflies recalled having lunch in Bali. (And it looks amazing!)

Raelynn kicked it back to a road trip two years ago.

Awww! A Great Big World shared a pic of band member Chad and his amazing pants.