VIDEO: Check Out A Sneak Peek of Patti LuPone On CBS' MOM, Airing Tonight!

On tonight's episode of MOM, "A Taco Bowl and a Tubby Seamstress", Christy is concerned that she and Bonnie might lose their apartment when Bonnie locks horns with the tough new building owner, Rita (Patti LuPone).

LuPone is a two-time Grammy Award winner and a two-time Tony Award winner. She is also a 2006 American Theater Hall of Fame inductee. The actress made her Broadway debut in Three Sisters in 1973. She received the first of six (as of 2014) Tony Award nominations for the 1975 musical The Robber Bridegroom. She won the Tony Award for Best Actress in a Musical for her role as Eva Perón in the 1979 original Broadway production of Evita. She played Fantine in the original London cast of LES MISERABLES and Moll in The Cradle Will Rock, winning the 1985 Olivier Award for Best Actress in a Musical for her work in both. She won a second Tony Award for her role as Mama Rose in the 2008 Broadway revival of Gypsy.

Other stage musical performances include her Tony-nominated role as Reno Sweeney in the 1987 revival of Anything Goes, her Olivier-nominated role as Norma Desmond in the 1993 original production of Sunset Boulevard in London, her Tony-nominated role as Mrs. Lovett in the 2005 production of Sweeney Todd: The Demon Barber of Fleet Street, and her Tony-nominated role as Lucia in the 2010 original production of Women on the Verge of a Nervous Breakdown. She also won two GRAMMY AWARDS for the recording of the 2007 Los Angeles Opera production of RISE and Fall of the City of Mahagonny; for Best Classical Album and Best Opera Recording.

On television, she starred in the drama series Life Goes On (1989-1993) and received Emmy Award nominations for the TV Movie The Song Spinner (1995) and for her guest role in the sitcom Frasier(1998). She also had a role in the third season of the FX thriller series American Horror Story: Coven(2013-2014). Her film appearances include Witness (1985), Driving Miss Daisy (1989), State and Main(2000) and Parker (2013).

Anna Faris and Emmy Award winner Allison Janney star in this pulls-no-punches comedy from Executive Producer Chuck Lorre ("The Big Bang Theory," "Two and a Half Men," "Mike & Molly"). Christy is a single mom who, after years of questionable choices, is now sober and trying to get her life on track. She's tested daily by her newly sober mother, Bonnie, who is trying to make up for all the ways she's let Christy down. Christy is further challenged by her relationships with her own kids. Her daughter Violet is engaged to a man twice her age and her ten-year-old son, Roscoe, would rather live with his father Baxter, a former slacker who has only recently gotten himself together. To help her stay sober, Christy relies on her support system from AA, comprised of her sponsor Marjorie, her wealthy sponsee, Jill, and her emotional friend, Wendy. Christy tries to remain positive as she attempts to overcome her past and build a better future, but with her dysfunctional family and life's many setbacks, it's always an uphill battle.

Check out the clip below!