Adam Levine had his girlfriend turned fiancé Behati Prinsloo by his side on New Year's Eve. The Maroon 5 lead singer and his bandmates performed on December 31st at Las Vegas' Mandalay Bay. Following the show the men and their ladies headed over to LIGHT Nightclub.

According to E! News, the group ditched the standard all-black everything outfit most celebrities wear for a night out and instead the 34-year-old who was given the title of Sexiest Man Alive decided to go for a much more entertaining touristy look.

Adam Levine and Behati Prinsloo were joined by Ali Tamposi, Maroon 5 member James Valentine's girlfriend, who took to Instagram to post a photo of the "Love Somebody" artists getting their New Year's Eve kisses.

In photo the "Payphone" singer rocks a pink cowboy hat featuring a tiara and the words "Happy Las Vegas" bejeweled across the front while his fiancé gives him a sweet kiss on the cheek.

Levine paired the frilly accessory with a floral Hawaiian themed shirt and some scruffy facial hair. Meanwhile, the 24-year-old South African beauty wore a black dress.

Apparently the group had a great time at the club. E! News reported that an eyewitness revealed the friends arrived to the club just after 1 a.m. and stayed for about an hour.

Prior to that they headed over to Kumi sushi earlier in the night for a pre-show meal and decided to keep the party going after hours with vodka and Dom Perignon champagne.

The onlooker said that Adam Levine and Behati Prinsloo "acted super lovey dovey," adding "but they didn't keep to themselves. Both were very social with the rest of the table. Behati has definitely won over his bandmates-they seemed to love her. The girls, too - everyone was getting along great and having fun."

Well that sounds like a great New Year's! How did you spend the first hours of 2014? Let us know in the comment section below.