2017 CMT Music Awards - Red CarpetKatherine Heigl is "Suit"-ing up.

The "Grey's Anatomy" alum is joining the cast of USA's legal drama "Suits" in season 8 as a series regular. Her addition follows on the heels of the departure of stars Patrick J. Adams and Meghan Markle.

She'll fill a void left by Markle, who is retiring from acting ahead of her marriage to Prince Harry. Meanwhile, "Psych" alum Dulé Hill was promoted from a recurring role to step into Adams' shoes opposite star Gabriel Macht.

Heigl — who most recently appeared in the short-lived CBS drama "Doubt" — will play Samantha Wheeler, a new partner at Pearson Specter Litt who will be "the firm's greatest ally or most powerful enemy."

"I cannot wait to have [Heigl] come play with our entire cast and crew," said showrunner Aaron Korsh. "Unfortunately, the same cannot be said for Harvey, Louis, Donna and Alex as the mysterious Samantha Wheeler is a direct threat to their status quo. One thing is for sure — Samantha's wit, charm, loyalty, strength and vulnerability will all be put to the test as she muscles her way into the firm currently known as Pearson Specter Litt."

"Suits" has undergone some seismic shifts in the last couple of years, first with the exit of Gina Torres as firm boss Jessica Pearson. And Adams and Markle will say farewell in the Season 7 finale, which will air in April.