Moynahan will make a special guest appearance as Erin Reagan in the premiere and will also direct an upcoming episode of the spinoff

Why so blue? Easing your transition from “Blue Bloods,” another familiar face will be popping up in the series premiere of CBS’ upcoming “Boston Blue”: Bridget Moynahan is set to reprise her role as Erin Reagan,

Bridget Moynahan will reprise her character of Erin Reagan in the series premiere of Boston Blue, the spinoff series that follows Erin’s brother Danny ( Donnie Wahlberg) as he moves from New York to Boston. Moynahan is also set to direct an episode of the new show later in the season; she previously helmed three episodes of Blue Bloods .