Reba McEntire is about to add a new role to her life: grandma! The country superstar's son, Shelby Blackstock, is expecting his first baby with wife Marissa Blackstock. The couple announced the news via Instagram on Tuesday, April 14, sharing several photos of themselves celebrating at Disney World. "Oh, BOY! We're beyond excited to FINALLY announce our little man is coming in October," the duo wrote in their caption. "See ya real soon, pal! Mommy + Daddy love you! 🤟🏼.