By Emily Sheridan
Wet 'n' wild: The Only Way Is Essex stars Billie (left) and Sam Faiers spent Sunday at the Rehab pool party at the Hard Rock Hotel in Las Vegas
Since arriving in Las Vegas a few days ago, Sam and Billie Faiers have been hitting the city's nightclubs with abandon.
But yesterday, The Only Way Is Essex co-stars decided to turn their nocturnal revelry into daytime as they attended a pool party.
The blonde siblings and their group of girlfriends joined hundreds of revellers at the 'Rehab' party at the Hark Rock Hotel & Casino on Sunday afternoon.
Cheers! The two sisters swigged bottles of beer as they partied with their friends
Entertaining the revellers was former Fugees rapper Wyclef Jean, who was DJing at the popular event, where temperatures soared to 100 degrees Fahrenheit (37C).
Elder sister Billie, 22, showed off her very curvy frame in a frilly tan two-piece, which just about managed to contain her ample 30H cleavage.
She has complained her large, natural breasts given her frequent backache, but has decided against getting them reduced.
'OMG, this reminds me of Marbs': Billie chats to her friends in the pool
Missing Joey? Sam chats to her friend, make-up artist Benny Hancock on a lounger
She said recently: 'I’m 5ft 4in and a size 8 with massive boobs, so when I started on TOWIE everyone wrongly assumed they were fake.
'My back constantly aches and my shoulders tense up with the weight of them. It builds up during the day and by night-time, it’s really painful.'
But it looked like her little sister Sam, 21, narrowly missed a wardrobe malfunction as her multi-coloured monokini nearly slipped off.
Super tanned: Billie's skimpy bikini made sure she could top up her year-round tan
Beer o'clock: Billie kept herself refreshed with an ice cold beer
With temperatures so hot, the women spent most of the party cooling off in the pool.
Having arrived in Nevada last Thursday, the Faiers sisters and their five girlfriends have been partying every night.
They've already been spotted at Chateau at the Paris Hotel, Wet Republic at the MGM Grand, Surrender nightclub at Encore, Tao nightclub at the Venetian Hotel and Spearmint Rhino.
Joining the sisters in Nevada's Sin City are their friends Ferne McCann, Charlotte Robertson, Kay Hawkins, Stacey Milburn and Gemma Brooks.
Ample: It looked like Billie's bikini was fighting to contain her cleavage
What happens in Vegas, stays in Vegas: Sam chats to a male reveller
Ahead of the party, Wyclef tweeted he was watching the England V Italy Euro 2012 game.
He said: 'Italy vs England i am glued to the TV till 3.00 then I go Rock the rehab pool party! I'm in Vegas baby! Needed a little fun! Was stress!
'Italy won the game! Wow about to go on stage now at Rehab! Only in Vegas! Pool part time.'
Bit wet: Sam gets splashed in the pool
Sun safe: Sam and a male acquaintance make sure they protect their skin with SPF
It's hot, hot, hot: With temperatures so warm, most revellers spent their time in the pool