Vanessa Williams will make a guest appearance as a wealthy donor while Peter (Chris Noth) and Alicia (Julianna Margulies) will reignite their old flame in Sunday's all-new episode of "The Good Wife."

Williams, who has been cast in an "arc" in the series, will make her debut on the show in the next episode, which is titled "Driven." She will play a sexy businesswoman named Courtney Paige, who Ruth (Margo Martindale) and Eli (Alan Cumming) try to solicit so that she can donate to Peter's presidential campaign.

Earlier this year CBS described William's character as "an extremely successful, self-made businesswoman who is potentially interested in backing Peter Florrick's campaign for President. In the process, she meets Eli, sparking a mutual attraction," TVLine reported.

Meanwhile, Alicia and Lucca (Cush Jumbo) will work on a case involving an automotive executive and his employee who test drove a self-driving car that was involved in an accident.

A preview video also reveals that Alicia will end up sleeping with her cheating ex, Peter, after she allows him to move in with her in order to help booster his image as a family man to impress Courtney.

Peter's plan to appear as happily married to Alicia in front of Courtney will go smoothly until Jackie (Mary Beth Peil) and Howard (Jerry Adler) show up to announce their engagement, reports TV Guide.

The series also released an exclusive sneak peek via The Hollywood Reporter showing Peter's awkward run in with Alicia's new investigator, Jason Crouse (Jeffrey Dean Morgan). In the clip, Peter surprises Alicia by showing up at her door with an entourage and announcing that he plans to stay with her for a few days. However, it just so happens that Jason was at Alicia's house when Peter pops up.

According to Carter Matt, the synopsis for "Driven" reads as follows:

"Alicia and Lucca join a case involving an automotive executive represented by Lockhart, Agos & Lee, and an employee represented by Louis Canning, who was involved in a crippling accident while test-driving a car operating in "driverless" mode. Also, when Ruth and Eli pursue Courtney Paige (Vanessa Williams), a potential campaign contributor, Peter moves back in with Alicia to present a united family image."

Episode 7 of Season 7 of "The Good Wife," "Driven," airs on Sunday, Nov. 15 at 9 p.m. ET on CBS.

Watch preview videos below.