Ashley Hebert and fiance J.P. Rosenbaum go shopping for wedding bands at upmarket jewelers Neil Lane in West Hollywood, California. Credit: Deano/Splash News

With their big day just a month away, season 7 Bachelorette Ashley Hebert and her fiancee, J.P. Rosenbaum, picked out wedding bands at Neil Lane in L.A. Nov. 5, a source tells Us Weekly exclusively.

"They walked in holding hands and smiling," a witness says of the New Jersey-based pair, who cemented their May 2011 engagement in Fiji with a 3.5-carat cushion-cut diamond by the same jeweler, long beloved by Bachelor stars and other Hollywood celebs.

The outing was filmed for their December wedding special, set to air on ABC. At one point, says the witness, "Ashley stood with her arms resting over his shoulders. And he gave her a tender kiss."

Hebert, a University of Pennsylvania dental school grad, and Hebert, a construction Manager in New York City, have only grown stronger in the last 19 months. "This is going to sound pretty cheesy, but we are pretty compatible," Hebert, 28, told Us earlier this year.

As for Rosenbaum, 35? "She has her little idiosyncrasies," he told Us, "but it's what I love about her."