Justin Timberlake & Jessica Biel
09/07/2011 AT 10:00 AM EDT
and Jessica Biel
were in Steamboat Springs, Colo., for her friend's wedding, and the apparently on-again duo
enjoyed the weekend together. They hit up the Tugboat Grill & Pub, a local bar on a mountain, and even rode a gondola up to brunch. Says an onlooker: "There was plenty of P.D.A., and they seemed happy."