Emily Blunt and John Krasinski
08/22/2011 AT 10:00 AM EDT
and wife Emily Blunt
kept dinner casual on the patio of West Hollywood's Chateau Marmont
. Krasinski, in a navy hoodie and jeans, led much of the conversation while he and his wife dined with another couple – spaghetti bolognese for him, salad for her. The two were definitely enjoying the night and their company – and "everyone was laughing and smiling," an onlooker says. At one point Krasinski even led the group in a toast.