No, they’re not asking you to pull their fingers. (Well, Gary might be.) They’re celebrating the chart-topping success of Shawn Mendes’ single, “There’s Nothing Holdin’ Me Back” (Island), which just went #1 at Top 40 radio. Seen just before being trampled by a stampede of screaming girls are manager Andrew Gertler, iHeart’s Sharon Dastur, Mendes and Republic promo chief Gary Spangler.