It's a New Year's Eve tradition to kiss at midnight, and Kanye West was happy to follow through on it with his baby mama Kim Kardashian. The expectant parents exchanged a kiss on the lips when ringing in 2013 together at the Mirage hotel's 10AK nightclub in Las Vegas.

The mom-to-be shares on her official blog pictures that show her celebrating the New Year with the rapper. "New Years was a lot of fun! I spent it with my close friends and my boyfriend. We went home a little early, but it was such a fun way to ring in the New Year with everyone I love!" she gushes.

Kanye suited up for the party, while Kim opted for a Julien MacDonald dress that hugged her curvaceous figure like a glove and arranged her lush hair in a messy braid. They smooched as the crowd was partying in the background. Kris Jenner was also seen at the same party with them.

The couple jetted off to the Sin City a few hours after arriving back in Los Angeles from their trip to the Atlantic City. She accompanied him to perform three-night concert at Revel, during which he broke news about her pregnancy on his final night at the resort & casino.