The "Mistresses" are a foursome again.

Jennifer Esposito has joined the cast of ABC's summer drama as a new series regular, according to The Hollywood Reporter. She will fill the void left by Alyssa Milano, who announced her exit from the show last October.

The former "Blue Bloods" star will play Calista Raines, "an uber-fabulous and larger-than-life woman with a wicked sense of humor and style," according to The Hollywood Reporter. She will join the women's inner circle through Joss (Jes Macallan), who she will befriend, mentor and serve as a surrogate sister.

Calista works as the creative director for a luxury fashion brand and has a "high-class socialite lifestyle" to boot. She also has a darker side as a lonely woman with a devious nature and will draw "Joss deeper and deeper into a world of secrets and betrayals."

Esposito recently starred on the NBC series "Taxi Brooklyn" and starred as Donnie Wahlberg's partner on "Blue Bloods" for 2+ seasons. Her credits also include "Spin City" and "Samantha Who?" as well as recurring roles on "Rescue Me" and "Judging Amy."

Milano chose to leave the show when "Mistresses" moved production to Vancouver after shooting the first two seasons in Los Angeles. She has two children under four years old and didn't want to "uproot" them or move away from her family.

"It's with a heavy heart that I have decided that I can't relocate," Milano said at the time. "I will miss this job desperately and wish everyone the absolute best."

"Mistresses" also stars Rochelle Aytes, Yunjim Kim, Jason George, Brett Tucker and Erik Stocklin.