Kim Kardashian flashed major cleavage during a sisters' night out with Kourtney and Khloe Kardashian on Sunday, Feb. 16 Credit: Splash News Online

Brrr! Not even chilly weather in New York City can stop Kim Kardashian from showing off her assets. The Keeping Up With the Kardashians reality star flashed some major cleavage during a sisters' night out on Sunday night.

Kardashian, 33, was photographed wearing a tight-fitting black ensemble alongside sisters Kourtney and Khloe as the ladies headed into 1oak nightclub on Feb. 16. Despite the freezing temperatures, she exposed her decolletage in a cleavage-baring bodice and tried to keep warm in a black coat and matching stockings. Kourtney, 34, meanwhile, looked glamorous in a white suit, and Khloe, 29, bundled up in a blue and black jumpsuit. "[I feel] amazing, great," Khloe told Us as the trio arrived.

Once inside, the sisters headed to a back table in the VIP area, as the DJ gave Kim K. a special welcome by playing fiance Kanye West and Beyonce's "Drunk in Love" remix. Best friend Jonathan Cheban, Simon Huck, and cameras for their E! reality show were also on hand.

"Khloe looked really comfortable and like she was having a fun night out," an eyewitness told Us of the outing. "Kourtney and Khloe started fist bumping together and smiling a lot during 'What You Know' by T.I.

The ladies partied only for a short while, and left around 10:30 p.m. to head to their second venue for the evening -- downtown's Tao restaurant. "Kourtney, Kim & Khloe Take New York," Kim joked via Instagram, sharing a collage of the women the next morning on Feb. 17.

Kim's NYC outing wasn't the only big event for KUWTK fans Sunday night. While the sisters hit the town, Kardashian's October 2013 proposal from West finally aired on television. During the night, North West's mom replied to fans who were watching the show live, and also shared a picture of her engagement ring again via Twitter. "#DreamsDoComeTrue," she gushed.