Bridget Moynahan is joining her brother in blue. The actress, 54, is officially set to return as Erin Reagan in the “Blue Bloods” spinoff, “Boston Blue.” The new show will follow Danny Reagan (Donnie Wahlberg) as he leaves the Big Apple to take a position with the Boston Police Department.

"More fun (and surprises) to come," Wahlberg teased. "Let’s go!" Donnie Wahlberg is reuniting with a key member of the Blue Bloods family. The New Kids on the Block star celebrated the announcement of his on-screen sister,

At least two true Reagans have reunited as CBS’ Blue Bloods spinoff continues production on its series premiere. As revealed on social media Friday morning, Bridget Moynahan is on-set in Toronto at Boston Blue,