Blake Lively and Bart Johnson are in-laws:
Megastar Blake Lively — Gossip Girl, A Simple Favor, Sisterhood of the Traveling Pants, to name a few — has a half sister named Robyn (you know, from Teen Witch) and that sister just so happens to be married to Troy Bolton's dad.
Really? You never heard of them so they are nobodies?
Everyone in here is or was a-list. I suppose you recognized the Nickelodeon stars