Bridget Moynahan is reminding fans that once you're a Reagan, you're always a Reagan with a sweet tribute to TV dad Tom Selleck as he celebrates another year around the sun. "Happy Birthday to the best TV Dad! #TomSelleck #happybday," Moynahan, 54, wrote via X on Thursday, January 29, paying homage to her Blue Bloods costar. Moynahan shared a photo with Selleck, 81, that appears to be from the Blue Bloods set. The pair are all smiles in the picture as Selleck sits at a kitchen table and Moynahan leans over his shoulder to pose for the camera.