While Rachel Griffiths has been taking time off from "Brothers and Sisters" following the birth of her daughter, her character -- Sarah Walker -- has been off-camera checking out vineyards in France, where she happens to meet a very sexy Frenchman -- Gilles Marini as Luc Laurent.

"She is doing some business in France and, fortunately or unfortunately, she gets a bit lost and we meet," Gilles tells ET. "To me, I see her and it is love at first sight. I am very attracted to her, and we spend time together in France, which leads Luc Laurent to make a very drastic move, drop everything and leave France behind and go to America to see her."

Luc arrives as preparations are underway for Justin's (Dave Annable) wedding -- and last season's "Dancing with the Stars" second-place finalist volunteers to help Nora (Sally Field) teach her son to dance.

"It is fun dancing with him," says Dave, who admits his dance background includes The Sprinkler.

Also on the "From France with Love" episode, Sarah distracts Kitty (Calista Flockhart) through chemo treatments with tales of her intense romance with Luc, and Justin struggles with his first anatomy class and seeks advice from his professor (Joe Morton) about how to survive the semester with his genius, teenage lab partner.

"Brothers and Sisters" airs Sundays at 10 p.m. on ABC.