Sulli cut a retro figure in a black see-through lace dress in her new Instagram photos, taken as she was leaving for a party in New York City.

The former member of K-pop girl group f(x) looked mature with a sleek side-swept hairstyle as she was getting ready to attend a party in New York City thrown by cosmetics company Estee Lauder.

(Sulli's Instagram)

The singer donned the shiny broad-shouldered dress that snatched her waist with a ribbon, accentuating her look with bright red lipstick and big silver earrings complete with black high heels.

Sulli sounded excited as she went on a posting spree in New York, documenting her experience of the exclusive party in detail.

(Sulli's Instagram)

She posed in front of a lit-up escalator in a dark building with a caption in Korean. It read, “So happy. It’s morning in Korea but it’s night in New York.”

In a series of similar posts, Sulli appeared to be all smiles while having fun and posing with other partygoers.

By Yim Hyun-su (hyunsu@heraldcorp.com)