At the Backstreet Boys “Into the Millennium” show in Las Vegas, Mila Kunis and Ashton Kutcher turned up the nostalgia—and the romance. Decked in matching white tees and navy bottoms, the longtime couple sang their hearts out to “I Want It That Way,” swaying together, sharing laughs, and embracing with sweet gestures. Mila pulled Ashton close while he wrapped his arms around her waist; at one point he gently held her face. Fans captured the moment—and their joy—that felt both effortless and full of love.