“Vanderpump Rules” executive producer and star Lisa Vanderpump addressed the scandal surrounding longtime castmember Tom Sandoval, dubbed the “Scandoval,” during her first appearance on Andy Cohen’s “Watch What Happens Live” in more than a year.

After taking time away from appearances on the late-night show due to an injury, Vanderpump returned to “Wwhl” on Wednesday to speak with Cohen about castmate and business partner Tom Sandoval’s shocking breakup with longtime partner Ariana Madix, after news broke of his affair with fellow castmate Raquel Leviss on March 3.

“I didn’t see it coming, nobody saw it coming,” Vanderpump said, adding she was “gobsmacked” and “flabbergasted” when she learned of the secret relationship between Sandoval and Leviss that led to the end of his nine-year relationship with Madix.

Though “Vanderpump Rules” is currently airing its 10th season on Bravo, the “Real Housewives of Beverly Hills” alum shared that the show...