Steve Kazee shared a sweet tribute to his son, Callum, to celebrate the little one hitting his 3-month milestone.“This little guy turned 3 months old a few weeks back and he has been a constant reminder to lead with love, to teach your children well, and to fill their hearts with love, compassion, and empathy for others,” the Broadway star, 44, gushed in a loving Instagram post on Wednesday, June 17.