Dave Grohl joins The Pretenders ... smiling together during an outing, with Grohl sporting a hat, thick-rimmed glasses, a black long-sleeve shirt, and cargo shorts. Blum opted for green striped ...

Dave Grohl and his wife ... dressed casually for the rare joint outing, with Grohl wearing cargo shorts, a long-sleeved shirt, Puma sneakers, a black baseball cap and glasses.