Esposito, 37, joined the show in October as Detective Jackie Curatola, the new partner of Donnie Wahlberg's Danny Reagan, who had two partners before her.
"Jennifer is a wonderful addition to the cast," executive producer Leonard Goldberg said in a statement. "She brings creativity and energy to the set every day and is a perfect match for Donnie Wahlberg's character. We are thrilled to have her on the Blue Bloods team."
Blue Bloods airs Fridays at 10/9c on CBS.