Actress Niecy Nash attends the Television Academy's 70th Anniversary Gala on June 2, 2016 in Los Angeles, California.

Actress Niecy Nash attends the Television Academy’s 70th Anniversary Gala on June 2, 2016 in Los Angeles, California.

*Niecy Nash will guest star on the fourth season of Showtime’s “Masters of Sex.”

The actress, most recently of HBO’s “Getting On,” will appear in a multi-episode arc as Louise Bell, a local Alcoholics Anonymous-chairperson running Masters’ (Michael Sheen) court-ordered daily meetings, reports Variety.

Betty Gilpin will also guest star in several episodes next season. She’ll play Nancy, a former medical student of Barton’s (Beau Bridges), who partners with Masters, adding a second MD to the practice.

Production on Season 4 recently began in Los Angeles and will premiere Sunday, September 11 at 10 p.m., reports Variety.