Lara Spencer's son has enjoyed a special prom night and graduation from high school - leaving his mom in tears.The Good Morning America anchor took to social media to share a picture with her eldest son, Duff, sharing that she was "already tearing up" even though graduation was still a few hours away."I know many of you have been here, and there is such comfort in that," she shared.MORE: Good Morning America's hosts' homes - take a look inside Lara's son Duff is graduating from high school"My