Allison Williams looked incredible while attending a special screening of her film M3GAN with fiancé Alexander Dreymon on Wednesday in New York City.The Girls star, 34, shimmered in a sleeveless silver dress that showed off her toned arms, which she teamed with a pair of classy black pumps. It was the first red carpet outing for the couple since announcing their engagement in December, one year after quietly welcoming a son. Stylish pair: Allison Williams, 34, looked incredible while attending a special screening of her film M3GAN with fiancé Alexander Dreymon, 39, on Wednesday in New York CityThe daughter of former NBC Nightly News anchor Brian Williams wore her brunette tresses parted on the side and flowing in gentle waves. The actress accessorized the look with a chunky bracelet and a number of rings on her fingers.As for glam, the star highlighted her cheeks with a touch of blush and wore red lipstick on her pout. First red carpet: It was the first red carpet outing for the couple since announcing their engagement in December, one year after quietly welcoming a son Meanwhile Dreymon, 39, looked dapper in a navy cardigan over a white button-up shirt and a black tie.Dreymon confirmed he had popped the question to Williams in a sweet Instagram post last month, when he called the beauty 'my fiancée'.Allison also revealed her sparkling diamond engagement ring as she hit the red carpet at another premiere of the film.