The glamour model - voted Big Brother's sexiest-ever housemate - had enjoyed a night out with friends at Nobu Berkeley on Friday before her night was rudely cut short.
After being turned away, Imogen was left to wait for half an hour while a car was arranged to take her home.
Notorious nightclub The Box boasts an enviable guestlist - recent celeb customers include LEONA LEWIS, KATE MOSS, JUDE LAW, SNOOP DOGG, FREDDIE LJUNGBERG, COCO SUMMER, VANESSA HUDGENS, JAIME WINSTONE and KEIRA KNIGHTLEY.
And it's popular with the royals including PRINCE HARRY, PRINCESS BEATRICE and ZARA PHILLIPS.
Well-heeled punters swig from £70 cocktails and pricey champagne ahead of what they expect to be a most enticingly decadent cabaret show.
But a recent Sun investigation found that simulated sex acts were carried out as big-name stars sat just feet away at their £5,000 reserved tables.
Earlier this week The Sun revealed that Thomas is preparing to flee after being terrorised by death threats from fans of her ex-lover RYAN GIGGS.
Sources revealed Imogen, 28, is so frightened of attack she plans to fly away on holiday as soon as possible, and will quit her London home when she returns.
Cops are hunting sick Twitter users who sent messages threatening to kill the former Miss Wales and her family.
The onslaught began after Man United ace Giggs, 37, was outed as the footballer using a superinjunction to hide his shame.
Read more: http://www.thesun.co.uk/
