Jesse James and Kat Von D
Albert L. Ortega/PictureGroup
09/07/2010 AT 12:00 PM EDT
After a "smooch-filled" lunch at L.A.'s Urth Caffé
, Jesse James
and girlfriend Kat Von D
headed down the street for some hands-on shopping at J. Gerard Design Studio and Peace Gallery. While the LA Ink
star browsed couture gowns, James doted on her. "He kept on kissing her and wrapping his arms around her from behind," the onlooker says of the duo, who "were finishing each other's sentences." Adds the onlooker: "The romantic chemistry was palpable." The two also picked up his and hers "Rebel with a Cause" T-shirts, and James bought Von D a glass bead lariat-style necklace, which she wore out the door.