They only arrived on Saturday, but Lucy Mecklenburgh, Sam and Billie Faiers, Gemma Collins and Ferne McCann are already feeling the effects of too much alcohol and not enough sleep.
No one's been giving anything away about their all-expenses-paid trip State side, but the gang have been Tweeting about how much fun they're having partying in the desert - it's all right for some!
There have a been a few awkward moments though. Ferne McCann, who joined the show in series nine, was forced to reunite with her ex-boyfriend Charlie Simms who she hasn't seen since August. The pair were dating for three years, but they haven't spoken since Charlie was papped kissing another girl in Ibiza.
Take a look at some of the TOWIE gangs' best Tweets and videos below...
#Vegas is treating me well but seriously need a nap before tonight !! Chilling in the room ! Hurry up girls and come back!! I have icecream— sam faiers (@SamanthaFaiers) September 24, 2013
What do you think? Are you looking forward to the Las Vegas special?
FLIGHT GROUNDED BY SNAKE ON THE PLANE
CARA DELEVINGNE VISITS MILAN CATHEDRAL AT SUNSET
RIHANNA SELFIE LEADS TO ARREST OF POACHERS IN THAILAND