. He’s joining fellow rockstars like Bryan Adams (who attributes his youthful look at 60 to veganism), Ellie Goulding, Ariana Grande, Will.I.Am, and Sir Paul McCartney in going vegan this Veganuary. Let’s not forget he’s a screen star too so he joins Benedict Cumberbatch, Natalie Portman, and Simon Cowell who recent lost nearly 50 pounds…