Donnie Wahlberg is filled with emotion over his former 'Blue Bloods' costars and new 'Boston Blue' costars embracing each other. 🥹 "I'm so grateful that we've gotten to honor the shoulders we stand on with this show," the actor tells EW of the CBS spinoff, which premieres its second season on Oct. 9. This season welcomes appearances by #BlueBloods stars Len Cariou, who played Wahlberg's grandfather, and Will Estes, who played his brother. Wahlberg says both actors' presence on his current set brought joy to him and showrunners Brandon Sonnier and Brandon Margolis. Check the link in @entertainmentweekly's bio for more about the new sesason. #BostonBlue #DonnieWahlberg