She's openly spoken about her struggle to find clothes for her large cleavage in episodes of The Only Way Is Essex.
But it looks like reality star Billie Faiers's latest bikini isn't quite enough to contain her ample chest.
Relaxing by the pool in Las Vegas with sister Sam and their girlfriends, the 22-year-old repeatedly kept fiddling with her bikini top, perhaps nervous it wasn't going to stay on.
All white now: The Only Way Is Essex star Billie Faiers shows off her curves in a white bikini in the pool in Las Vegas
Yes, its still on: Billie adjusts her revealing bikini top
While in the TOWIE gang's favourite holiday destination of Marbella, Spain, a wardrobe malfunction wouldn't be a huge deal, topless sunbathing is widely frowned upon in the U.S.
Although she dropped to a size 8 last year, Billie has returned to a curvier size 12 in recent months - demonstrated by her figure on holiday.
Curvy girl: Billie has returned to her size 12 figure after slimming down to an 8 last year
Bronzed: The boutique owner is said to be relaxing her diet and enjoying herself while TOWIE is on a break
'She'll begin working out gain when the show starts again next month.
'Billie jokes she has a "booze bloat" and says when she gains weight it goes straight on her stomach - her problem area - but she'd rather be happy than super-skinny.'
Colourful: Billie's little sister Sam was wearing a white bikini top and pink and lime bottoms
Interesting view: Sam tweeted a photo of her tanned body to boyfriend Joey Essex back in England
She said recently: '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.'
How do I look? Billie kept on her expensive gold watch and checked her hair was neat during her poolside relaxing
Adjustments: A nervous Billie check out her cleavage again as she adjusts her bikini ties
Practising safe sun: Despite her love of tanning, Sam was wearing factor 15 sun oil
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.
Viva Las Vegas: The group have been in Nevada since last Thursday
Super-tanned: Sam has been replacing her fake glow with a real tan
This is the life: Sam and Billie chat to their friend as they lie on the loungers
Upside down: Sam reaches over her sister for her mobile phone
Girls' trip: The Faiers sisters are holidaying with a group of their closest girlfriends