Kim Kardashian can’t pass up a great party, even if it’s not hers!

The newly engaged vixen held her bachelorette party in Las Vegas at Tao over the weekend, while fiancé Kris Humphries had his bachelor party next door at LAVO — and RadarOnline.com has learned Kim couldn’t resist popping next door to crash his party.

Bachelor and bachelorette parties are typically held separately, but Kris had no problem with Kim stopping by and even laid a wet one on her in front of the whole nightclub.

This is gearing up to be every bit as funny, and more, as the original 2009 smash hit.

The team behind The Hangover have released a sneak peek at the upcoming sequel, imaginatively titled Hangover II, reuniting all of the the original cast and set in Thailand.

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It's bound to be a drunken few days for Prince William as the groom-to-be says goodbye to his single days with his bachelor party this weekend, RadarOnline.com has learned.

The future King of England will be gathering his closest guy friends for a boys-only booze-up at a top secret location.

"It's top, top secret but the dates have been marked off in the diary and security knows every detail. For privacy reasons we can't reveal locations, but there will be plenty of booze and some legendary activities," a source told Us Weekly.

Before they have the wedding of the decade, royal party planners have to pull off the bachelor party of a lifetime for Prince William.

Left to his own devices, William's pal and best man Guy Pelly would love to throw a boozy bash that would no doubt land William in big trouble with not only his future wife, Kate Middleton, but probably his entire country too.

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That would be in keeping with a grand tradition of scandalous Royal bachelor parties that includes Prince Edward and male pals dressing up as women, a wasted Prince William dropping his pants in a pub at a pal's bash, Prince Phillip drinking all night and barely making it to the alter plus more!