Riley Keough recently stunned in a plunging sheer outfit. Fans marveled at the resemblance Keough shares with her late mom and grandad. Hollywood actress Riley Keough, 34, looked gorgeous in the black dress she wore to attend this year’s Emmys. The ensemble with glamourous pearl and diamante detailing had a plunging neckline, which left Riley’s décolletage exposed. The bottom half of the dress had a sheer veil covering a black and silver patterned skirt. She paired her Chanel look with chic black heels, dangling diamond earrings, and a silver reflective clutch bag. Riley posted an array of pic…