David Cameron's Wardrobe Malfunction Is Pretty Embarrassing (PHOTOS)

When you're one of the heads of state, you're expected to be on top of a lot of things: foreign policy, the tax code, trade agreements. And also, your shirt being properly buttoned.

For the UK's prime minister, David Cameron, one of those spinning plates dropped at Monday night's Lord Mayor's Banquet at London's Guildhall, where the British leader suffered a truly embarrassing wardrobe malfunction.

After the meal and after giving a speech on the vitality of Britain's banks, Cameron leaned back in his chair and apparently didn't realize that the entire front of his tuxedo shirt had become unbuttoned.

Britain's first lady, Samantha Cameron, didn't appear to be around to flash the prime minister a subtle "FIX YOUR SHIRT" look, but luckily, he realized it soon enough and took to re-buttoning.

The Telegraph notes that the three leading causes of shirt gape are "too tight shirt, "too big boobs" and "too much dinner." We won't speculate on the cause of Cameron Cleavage-gate. We only hope the breeze wasn't too chilly on his exposed chest.

PHOTOS:

See more wardrobe malfunctions below!

Want more? Be sure to check out HuffPost Style on Twitter, Facebook, Tumblr, Pinterest and Instagram at @HuffPostStyle.