Caroline Flack left her fans in a state of shock last night after accidentally posting a topless selfie on Instagram - with her nipple on FULL display.

Whoops.

The X Factor beauty posed up for a naked close-up, seemingly not realising her boob was in the shot too as she posted it to her 600,000 followers.

The brunette beauty quickly realised the embarrassing mistake, deleting the snap and swapping it for a cropped version - but not before her fans spotted it and began re-posting the picture online.

(Image: carolineflack/instagram)

Sorry Caz, nothing goes unnoticed on Instagram (as Kim Kardashian and a host of other stars know all too well after accidentally flashing rater too much).

She captioned the photo: “Bloody el... Hair and make up by @gemflossy.”

Fans congratulated the red-faced star on the mistake however, with one writing: "Seeing Caroline Flack topless this morning after she accidentally posted it on Instagram has made my morning."

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While another added: "A rare and fleeting glance at Caroline flack's nipple.. #totalbabe #gorgeous."

Caroline appeared to have launched into the photography session hours before attending Simon Cowell's star-studded bash last night.

(Image: Corbis)

Wearing a plunging black dress for the London party, the star appeared to go braless - unphased by her earlier mishap.

Wearing a tiny black dress, Caroline joined the whole Syco crew in style, showing off her famous legs in gold strappy heels.

It all meant we saw rather more of the X Factor co-host than we have done in the new series so far.

Her screen time was limited to just 93 seconds in Saturday night's show.

She was centre stage in the Strictly Come Dancing launch show on BBC1 though. The returning champion and partner Pasha Kovalev performed a sizzling salsa as the latest batch of celebrities were paired up with their professional dance partners.

And Ola Jordan suffered a wardrobe malfunction of her own after runner Iwan Thomas's enthusiastic reaction to discovering she will be partnering him on the show.