In honor of today's "Throwback Thursday," Ariana Grande tweeted a photo of herself in her childhood bedroom with the caption, "#throwbackthursday my house bed. The crayon pillow. My hideous tiger pajamas. My hair. There's so much going on here." Oh, we've all been there, Ariana. Inspired by the photo, we decided to gather a few other shots of young celebrities having fun in their childhood bedrooms. Check 'em out!