Donnie Wahlberg started acting before Mark Wahlberg.
Donnie Wahlberg . Outside of music , he has had roles in the Saw films , The Sixth Sense , Dreamcatcher , and Righteous Kill , also appearing in the World War II miniseries Band of Brothers as First Lieutenant Carwood Lipton . He has been starring in the drama series Blue Bloods as Danny Reagan with Tom Selleck ( his TV father ) and Bridget Moynahan ( his TV sister ) since 2010 , and since 2014 is an executive producer of the TNT reality television show Boston 's Finest .