Lachey will play Jane Tennant, the first woman to be named special agent in charge of NCIS' Pearl Harbor office. "A woman in a male-dominated profession, she's thrived in a system that’s pushed back every step of the way through equal parts confidence and strategy," according to CBS' description. "She's also a mother raising her children mostly on her own and has to balance her duty to her kids and her country." CBS also announced Yasmine Al-Bustami and Jason Antoon have also signed on as series regulars. Lachey previously starred on Fox's BH90210 and NBC's Truth Be Told. She was also a correspondent for Entertainment Tonight and a host of MTV's Total Request Live.