Donnie Wahlberg, Bridget Moynahan reunite for ‘Blue Bloods’ spinoff

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.

“Blue Bloods” aired its first episode in 2010 and followed a New York City family that worked in law enforcement. The star-studded cast also included Tom Selleck, Will Estes and Len Cariou as members of the tight-knit family.

CBS announced on Friday that Moynahan will make a guest appearance in the first episode of “Boston Blue.” She is also set to direct an episode during Season 1.

“Reunited and it feels so good!” Wahlberg, 55, captioned an Instagram shot with his longtime co-star while on set. “So excited to have my dear friend, and TV sister @bridgetmoynahan, join me for a special guest appearance in the premiere episode of #BostonBlue!”

“She’ll also be bringing her incredible directing talents to the show this season!” the star added. “More fun (and surprises) to come. 👀 Let’s go! 💙❤️.”

On July 8, the “Very Scary People” host posted a photo to his Instagram Stories from his first table read on the spinoff.

“A new chapter 💙,” Wahlberg penned beneath a snap of the pilot script.

Also set to star in “Boston Blue” is Sonequa Martin-Green, who will play his partner, Detective Lena Silver.

Rounding out the cast are Maggie Lawson, Marcus Scribner, Gloria Reuben and Ernie Hudson.

Earlier this month, CBS recast Danny Reagan’s son, despite Andrew Terraciano appearing as Sean Reagan in nearly every episode over 14 seasons.

Now, Mika Amonsen will take over the role of the youngest Reagan, who relocates to Boston with his father. Sean will work as a patrolman for the Boston Police Department, according to Deadline.

“Blue Bloods” aired its series finale in December after 14 on CBS.

At the time, Wahlberg penned a touching tribute to the police procedural and a love note to the show’s loyal fans.

“Dearest Blockheads,” the actor began on Instagram. “There is, of course, a sadness in saying goodbye to #BlueBloods. But what a heck of a ride we had together! You all were literally part of the Blue Bloods family! Not just on Friday nights (trending #BlueBloods every single week that it’s been on the air), not just in your impact on the Ratings (which was massive), you all made yourselves an actual part of the crew.”

Wahlberg added that everyone on the set “knew you, appreciated you and was happy to see you.”

“None — more than me. Of all the memories, highlights and moments, that I’ll look back on fondly from the last 14 years of filming #BlueBloods in New York City, your set visits will be something that I’ll cherish forever,” he shared.

The New Kids On The Block member went on to recall his cherished memories of viewers.

“You brought smiles, gifts, cupcakes (even though I was staying in shape for NKOTB tours), candy (too many Coffee Crisps and Kinder to mention), hugs, signs, inspiration and of course love. Some visitors — did not miss a season,” Wahlberg detailed. “Some visitors — we now miss so dearly.”

“I keep closing my eyes, and seeing your faces, as I’m writing this. I’m so thankful to you all. Please know that my heart is full. I can go on forever, about you, but it’s time to stop writing and to simply let these memories live. I thank you. I love you. I appreciate you. I salute you,” he continued before writing a sweet sign-off.

“My Blockhead/BlueBloods Family. See you on the next adventure. Coming soon.”

Selleck, 80, however, didn’t hold back from sharing his disdain over the end of the beloved series.

“I’m kind of frustrated,” the Emmy winner told TV Insider in October. “During those last eight shows, I haven’t wanted to talk about an ending for Blue Bloods but about it still being wildly successful.”

Selleck pointed out that the show still had strong ratings, as well.

“I’m not going to turn into a bitter old guy saying, ‘Get off my lawn!’ I don’t believe in holding grudges, but if you were to say to the television network, ‘Here’s a show you can program in the worst time slot you got, and it is going to guarantee you winning Friday night for the next 15 years,’ it would be almost impossible to believe.”

Selleck continued, “My frustration is the show was always taken for granted because it performed from the get-go. So how do I feel? It’s going to take a long time to sort all of this out.”

Despite his disappointment, the “Magnum P.I.” star isn’t done yet.

He told Town & Country in May, “I hope there’s another Western in my future. Certainly whatever happens with ‘Blue Bloods,’ I’m not going to stop acting.”

Meanwhile, that same month, Wahlberg admitted he did everything he could to save “Blue Bloods” before accepting the show’s fate.

“When it ended, we thought, ‘Okay, some of the network’s gonna come and say, let’s keep going.’ And nobody came, and it was kind of like we were all in denial about it,” he told Fox News Digital.

Wahlberg said that the opportunity for him to produce “Boston Blue” then came along.

“It was heavy, you know?” the singer confessed. “It’s, like, how do I do this? Like, how does [his character] Danny Reagan carry on? You know, how do we create this new world for this character, and how do we do it in another city, not in New York?”

Wahlberg mentioned that everyone involved in “Blue Bloods” — both in front of and behind the camera — was so important to him.

“They became part of our family,” he said. “You know, the viewers are saying, like, ‘How do we keep going with a Blue Blood spinoff without the whole family?’ And I share that. How do we do that, right?”

Wahlberg made the decision to move forward with the new project.

“It was definitely a challenge to take on this opportunity, but I kept saying to myself, you know, if I’m really sincere about wanting ‘Blue Bloods’ to carry on, here’s an opportunity to do it,” he detailed.

“Now, it’s just Danny going to this new world, but I can’t say a lot about it — but I could say, if he’s a Reagan, it will never be just Danny. There’ll always be a Reagan a phone call away. And the traditions that the Reagans have, Danny wouldn’t abandon those traditions.”