Paging all Kardashians – Metta World Peace wants to join your clan!

Sunday night saw one of the most monumental hip-hop concerts in recent history, and no one knew it was coming.

As guests arrived to celebrate DJ Khaled's birthday at LIV Miami at the Fontainebleau, they found themselves in the company of hip-hop icons Diddy, Kanye West, Fat Joe, Lil Wayne and Busta Rhymes. Also joining the fun: Kourtney Kardashian's longtime love Scott Disick – who was in town filming Kourtney & Kim Take Miami.

While some had heard rumblings of Diddy and company's attendance, no one expected what the night turned into – an impromptu concert!

"It was the craziest thing ever," says a source. "Maybe you've seen one or two of these guys perform, but never singing each other's songs together – it was amazing!"

Kanye, enjoying a boys' night out in a black leather T-shirt, received the most enthusiastic response of all when he hopped on stage with Fat Joe and performed his hit "Jesus Walks." The group wasn't taking the party lightly and ordered around 30 bottles of Ciroc Vodka.

Disick, who may seem the unlikeliest piece of the puzzle, apparently held his own with the rowdy group. "Scott surprisingly fit in really well; he seemed totally natural with the guys … you wouldn't have expected it," says one partygoer.

– Becky Randel

Happy (almost) Halloween!

Kim Kardashian and Kanye West celebrated Halloween early when Kardashian hosted the 2nd Annual Midori Green Halloween at Avenue in New York City on Saturday.

Kardashian's friends La La Anthony, Simon Huck, Carla DiBello and Joyce Bonelli also attended.

Dressed as a mermaid – with a blonde wig valued at more than $2,000! – all eyes were on Kardashian.

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From riding horses – to riding a roller coaster.

Kim Kardashian ditched her cowboy-worthy companion from last week for one of the more thrilling attractions at Six Flags Magic Mountain.

Perhaps a little too thrilling – judging by the pictures.

Braving the ride with boyfriend Kanye West and sisters Kendall and Kylie Jenner, Kardashian can't contain her fright in a picture she Tweeted Tuesday from their Santa Clarita, Calif., adventures.

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Fresh from Stéphane Rolland's haute couture show in Paris, Kanye West and Kim Kardashian made their way into popular local eatery L'Avenue earlier this week.

And they weren't the only famous faces eating there.

Spice Girl Melanie Brown and hubby Stephen Belafonte were halfway through their meal on the restaurant's terrace when they spotted the new couple walk in.

"Kim and Mel quickly greeted each other," an onlooker tells PEOPLE. "Mel took a moment to introduce Stephen to Kanye."

According to the source, after their meal Kardashian and West headed over to shop at Celine and Hermes, which were nearby.
– Peter Mikelbank

Fresh off her trip to Cannes, Kim Kardashian hosted a poolside bash in Atlantic City Sunday night. The reality star, accompanied by pal Brittny Gastineau, hosted The Pool After Dark at Harrah's Resort.

Kardashian, clad in a curve-hugging black dress, hung out in a poolside cabana with her pals, who sipped Midori Sour cocktails. She Tweeted a photo from the event, too.

Though the starlet kept to herself, fans went crazy for her, trying to get as close to her cabana as possible, according to a witness. But Kardashian kept her cool and left around 2 a.m.
– Jennifer Garcia

Kim Kardashian is usually the one in the spotlight, but she played an affectionate supporting role Wednesday at the premiere of boyfriend Kanye West's experimental film in Cannes.

West, 34, and Kardashian, 31, were among the first to arrive at the tented pyramid on Palm Beach for the screening of Cruel Summer, an immersive video experience with screens on all sides of the audience. As they posed for photos, the wind caught Kardashian's hair, and West gently smoothed it back into place.

The reality star, in a glittering mini dress and black booties and with slicked-back hair, was quietly adoring of West all night, sharing moments with him and helping to welcome friends including Jay-Z. As the film wrapped, she leaned over and whispered smilingly into West's ear and heartily joined in the standing ovation he was given.

She seemed relaxed, though quiet, at the afterparty, happily nuzzling against West and letting him have his moment to shine.
– Mary Green