Kim K and Beyonce spotted partying together at Jay-Z's concert

Kim Kardashian and Beyonce are set to become the most booty-full best friends in Hollywood, after pics of the two partying the night away at a Jay-Z concert that featured Kanye West, surfaced on Twitter.

The pair tried in vain to keep a low profile from swarming fans while their respective partners performed onstage, but according to one onlooker, they were in the mood for some serious booty jiggling.

"Kim and Beyonce were dancing all night! They even went into the mosh pit!" the source told Us Weekly.

"It was the most hectic thing ever!"

With dancing comes bonding, and it seems the girls' big night helped to mend a rift in their relationship.

"The girls have never really seen eye-to-eye," a source told the UK's The Sun.

"It's a shame because Jay-Z and Kanye are so close. Beyonce has always viewed Kim as a reality TV star who's not earned her fortune with a specific talent."

According to the source, Kanye, who has been dating Kim since March, set up a dinner for the two to "clear the air" before he and Jay-Z's gig.

"He's hoping now that they're pals it will lead to further get-togethers away from the tour. Beyonce has now welcomed Kim into the clan," The Sun's source revealed.

All that's left now is for the best buddies to shake those cabooses together in a video clip. Not that we'd suggest it, of course.

Kim and Beyonce give up on trying to hide from fans.

Kim is delighted with all the attention.

The bootylicious buddies enjoy the gig from behind a barracade, before getting loose in the mosh pit!