Brandon Blackstock's celebration of life has now been held... And it sounds like his girlfriend was front and center. On Tuesday, an insider told Us Weekly that loved ones gathered in Montana over the weekend to commemorate Kelly Clarkson's late husband: "Brandon's closest friends and family gathered over the weekend for a few days to celebrate his life in the place he loved most. It was very private." Brandon tragically passed away earlier this month after a three-year battle with cancer.