Bridget Moynahan to star in Boston Blue Bridget Moynahan has joined the cast of Boston Blue, the Blue Bloods spin-off series. 18 July 2025 Bridget Moynahan is set to star in the Blue Bloods spin-off series. Bridget Moynahan will star in the spin-off show The 54-year-old actress has reprised the role of Erin Reagan to star alongside Donnie Wahlberg in Boston Blue.