The Jonas Brothers' youngest member, Nick Jonas turns 21 today and what better way to celebrate it than in Las Vegas. Along with his brother, Nick and Kevin and their lovely ladies, Nick celebrated his 21st birthday at the XS Nightclub. Check out all the photos here.

Nick Jonas is certainly growing up to be one fine young man. Last September 15, Nick celebrated his 21st birthday in the company of family, friends and his "Miss Universe", Olivia Culpo. The fashionable three pairs headed out the the XS nightclub at Encore Las Vegas. Joe, Kevin and Nick also enjoyed a meet and greet of the "Le Reve - The Dream" cast present at the club.

Along with a cake and glasses of champagne, Nick partied the night long with Olivia Culpo, Kevin Jonas, Danielle Jonas, Joe Jonas and Blanda Eggenschwiler.

"Gearing up for my 21′st in Vegas T minus 2 hours and 40 mins till party time," tweeted Nick.

Olivia Culpo and Nick Jonas were certainly dolled up in love the whole night. According to onlookers, the "Nolivia" couple "were very playful and cuddly throughout the meal." On the other hand, Kevin Jonas was "doting on his expecting wife, Danielle, the entire time."

In a report by E! News, the three pairs enjoyed quite the meal that night. Aside from having been provided with signature chopsticks with their names engraved on each, Nick and his crew enjoyed several rolls of sushi. From crispy tuna to spicy tuna shrimp tempura, the lovely couples had their stomach filled to the brim.

Check out the slideshow to see more photos from Nick Jonas' 21st birthday.

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