Kim Kardashian wore a sexy white dress in Miami Beach with fiance Kanye West on Dec. 4. Credit: Seth Browarnik/

The future Mr. and Mrs. West! Kim Kardashian and Kanye West looked like the perfect bride and groom-to-be at the DuJour Art Basel party in Miami Beach, Fla. on Wednesday, Dec. 4. See more pics of the couple at the party.

Leaving 5-month-old daughter North at home, the new parents enjoyed a late night out together at Delano Beach Club. Kardashian, 33, showed off her slim post-baby body in a white peplum dress. The ensemble featured a sexy, deep cut-out in the front that exposed the reality star's cleavage.

Kardashian accessorized the look with her huge diamond engagement ring, and wore her hair straight and sleek. Rocking a complimentary, nuptial-inspired look, West wore a black button-down shirt and dark pants. He went more casual with his footwear, however, and wore brown boots.

An onlooker tells Us Weekly that the couple, who got engaged in October, arrived at the party a little after midnight. After briefly chatting with designer Roberto Cavalli on the red carpet, Kimye made their way over to a VIP area. The insider tells Us that West, 36, was all smiles at the event. He and Kardashian even posed for a photo with fellow partygoer Lionel Richie. After chatting with other guests for about an hour, the A-list couple left the party and reportedly went to LIV at Fontainebleau Miami Beach to continue the fun. At the nightclub, Kardashian and West posed for a photo with Lindsay Lohan.

Kardashian and daughter North have been traveling with West on his Yeezus tour. The Keeping Up With the Kardashians star recently defended her parenting style on Twitter when a commenter implied the parents are rarely with their baby. "[You] sound so ignorant. Bc I don't tweet or instagram my every move w my daughter means I am not with her 247? We share what we want," Kardashian wrote. "Or is it bc I go support my fiance at every show & I post pix? When the baby goes down 4 bed or a nap, parents are allowed 2 work & support each other."