Beyonce stole the show when she watched the Miguel Cotto and Saul 'Canelo' Alvarez boxing match with her husband Jay Z

Beyonce stole the show when she watched the Miguel Cotto and Saul 'Canelo' Alvarez boxing match with her husband Jay Z, at the Mandalay Bay Events Center in Las Vegas on Saturday night.
She flaunted some serious cleavage in an extra low-cut black gown..