Lea Michele
Lea Michele recently promoted her new single with the help of her “Glee” co-star, Darren Criss. Pictured: Michele at the 59th Annual Grammy Awards in Los Angeles on Feb. 12, 2017. Reuters/Mario Anzuoni

It’s been years since Lea Michele and Darren Criss starred on the hit FOX TV series, “Glee.” But the co-stars recently had a mini reunion via