Nick Carter’s 4-year-old son, Odin, celebrated his dad’s season 4 Masked Singer success on Wednesday, December 16.“Congratulations, Daddy,” the little one said in an Instagram video uploaded by his mom, Lauren Kitt. “We love you.”The fitness guru, 37, held Odin’s 14-month-old sister, Saoirse, in the footage, adding, “We’re so proud of you.