This Valentine’s Day, Hollywood icon Kevin Costner introduced his followers to a sleepy assistant in dishwashing duties. Amid the sparkle of celebrity, it’s the simple moments with man’s best friend that warm the heart. In the cozy intimacy of his home kitchen, Kevin Costner, the esteemed 69-year-old actor and star of “Yellowstone,” found companionship in an unexpected helper this Valentine’s Day. In a heartwarming Instagram Story, Costner revealed how he spent the romantic holiday performing a household chore with the newest addition to his family—a charming puppy named Bobby. The candid snap…