Kate McKinnon is joining the cast of “Saturday Night Live.”

She’s also the first openly gay female cast member in the show’s long history.

McKinnon, who cut her teeth on Logo’s “The Big Gay Sketch Show” — produced by Rosie O’Donnell — could make her first appearance as soon as tomorrow night in the “SNL” hosted by “Modern Family” co-star Sofia Vergara, according to Deadline.com.

McKinnon, a trouper in the New York-based Upright Citizens Brigade comedy team, has also been in several one-woman shows including “Disenchanted,” according to reports.

Terry Sweeney was the first gay man to appear on “SNL” as a cast member during the 1985 season — 10 years after the show’s premiere on NBC.