Model-actress Amber Valletta, who stars on ABC’s sexy drama “Revenge,” will appear in Cambridge on April 2 for this year’s Harris Center at Massachusetts General Hospital forum about health and beauty. She’ll participate in the “Health is Beauty: Defining Ourselves” discussion with Huffington Post founder Arianna Huffington, Vogue Italia editor in chief Franca Sozzani, and Harris Center Director David B. Herzog, a Harvard Medical School endowed professor of psychiatry in the field of eating disorders. You can register for the event on the Harris Center website. Valletta, who plays Lydia Davis on “Revenge,” appeared in the Sandra Bullock movie “Premonition,” the Michelle Pfeiffer/Harrison Ford movie “What Lies Beneath,” and in “Hitch” with Will Smith. Past participants in the Harris Center forum include Vogue’s Anna Wintour and Natalie Portman.