Donnie Wahlberg has finally opened up about the behind-the-scenes dynamic that shocked Blue Bloods fans everywhere. In a candid moment, he revealed that filming with co-star Tom Selleck wasn’t always the smooth ride viewers imagined. While their on-screen chemistry as father and son felt authentic, Wahlberg confessed there were moments off-camera that tested his patience—and his professionalism.

According to Wahlberg, working with a legend like Selleck came with unique challenges. He described long shooting days where creative differences flared and scenes had to be reworked repeatedly to match Selleck’s meticulous standards. “It was tough,” Wahlberg admitted. “Tom has his way of doing things—and he doesn’t bend easily.”

Still, Wahlberg was quick to point out the respect he holds for Selleck, despite the friction. “We butted heads, sure, but I never stopped learning from him,” he said. That mix of tension and admiration seems to have fueled their electric on-screen relationship, but fans are now seeing just how much work went into making the Reagan family feel real.

With the end of Blue Bloods approaching, Wahlberg’s honesty adds a layer of complexity to one of TV’s most beloved duos. It wasn’t always easy—but maybe that’s what made it great.