VIDEO: Sneak Peek - Octavia Spencer Guests on CBS's MOM

On tonight's episode of CBS's MOM titled "Toilet Wine and the Earl of Sandwich" - Christy and Bonnie help Regina tie up loose ends on the way to drop her off at prison.

The episode airs tonight, Monday March 17 (9:30 - 10:00 PM, ET/PT) on the CBS Television Network. Octavia Spencer guest stars. Get a sneak peek below!

MOM is a comedy from executive producer Chuck Lorre starring Anna Faris as a newly sober single mom raising two children in a world full of temptations and pitfalls, and multiple Emmy Award winner Allison Janney as her critical, estranged mother. Christy is a waitress at a posh Napa Valley establishment who is four months clean and doing her best to be a good mom and overcome a history of questionable choices. Her sobriety is tested when her recovering alcoholic mom Bonnie reappears, chock-full of passive-aggressive insights into Christy's many mistakes. Bonnie joins Christy's already complicated circle of relationships: her handsome, married boss - and lover - Gabriel; the restaurant's hot-tempered chef, Rudy; her pretty, 16-going-on-25-year-old daughter, Violet; her sweet but overly honest son, Roscoe; her irresponsible ex and Roscoe's father, Baxter; and Violet's clueless boyfriend, Luke. Christy tries to remain positive as she pursues her new path in life, but she faces an uphill battle, surrounded by a dubious support system - and a copious amount of dysfunction.