Katy Perry puts on a leggy display in a lace mini dress and thigh-high leather boots as she joins Petra Ecclestone, Robin Thicke and Madelaine Petsch at Sabrina Carpenter's gig in LA | Daily Mail Online

The Firework hitmaker, 40, put on a very leggy display in a tiny grey lace mini dress which she wore with thigh-high black leather boots.