It's Troian Bellisario (Spencer)! "Me and my bestie, Ash. #tbt #munchkins," Troian tweeted yesterday (January 31). Between the Olsen twins and this adorable friend, it looks like Troian had a ton of pretty little BFFs back in the day!
Catch the next episode of Pretty Little Liars on Tuesday, February 5, 2013 at 8 p.m. ET/PT on ABC Family.