Donnie Wahlberg just dropped some exciting Boston Blue news another familiar face from Blue Bloods is joining the spinoff. In a new Instagram post, Wahlberg confirmed that Bridget Moynahan, who played his on-screen sister Erin Reagan, will guest star in the series premiere and direct the episode.
“Reunited and it feels so good!” Wahlberg wrote. “So excited to have my dear friend and TV sister join me for a special guest appearance in the premiere episode of Boston Blue! More fun to come.”
Moynahan, who appeared in all 14 seasons of Blue Bloods as Assistant District Attorney Erin Reagan, is now the second original cast member officially confirmed for the spinoff. Danny’s son, Sean Reagan, will also appear though the role has been recast with Mika Amonsen, replacing Andrew Terraciano. The show follows Danny to Boston after Sean begins his career as a patrolman.
About Boston Blue
Announced in February 2025, Boston Blue shifts the franchise to a new law enforcement family, the Silvers, led by Reverend Peters. Wahlberg’s Danny Reagan teams up with Lena Silver
, a rising Boston PD star. The cast also features Maggie Lawson, Marcus Scribner, and Gloria Reuben.