Jennifer Lopez's "All I Have" Vegas After-Party – Get the Details on the Bash that Lasted 'Til Morning!

"All her friends were there and they were celebrating until late, after 2 a.m," an on-looker tells PEOPLE.

Photo: Matt Baron/BEI/Shutterstock

Jennifer Lopez came out all guns blazing for the debut of her "All I Have" residency in Las Vegas on Wednesday.

And after the show is the after-party!

After wowing her audience, the entertainer changed out of her 260,000 crystal-embellished Swarovski costume into a plunging white dress as the celebrations continued at Mr. Chow at Caesars Palace.

Just outside the Planet Hollywood concert, Matt Damon and the Bourne film crew shut down part of the Strip to shoot scenes.

PEOPLE has learned Lopez, 46, and boyfriend Casper Smart arrived late around 12:45 a.m. and headed into a private room with their A-list friends including her BFF Leah Remini.

The couple “were so cute and super PDA all night,” an on-looker tells PEOPLE. “Casper just kept kissing her, and telling everyone how proud he was.” After the show, PEOPLE caught up with Smart, who called it “the best show not only in Vegas, but anywhere.”

If performing a 90-minute show wasn’t tiring enough, J Lo and her pals partied all night, well after 2 a.m.

And let us introduce you to her party people in the club who got on the floor.

Derek Hough was dancing non-stop with his entourage, drinking champagne and doing dance moves with several ladies.

Ray Liotta was all smiles supporting his Shades of Blue costar. “He kept saying how excited he was for her,” an eyewitness tells PEOPLE.

Hoda Kotb may have been on assignment for the Today show but work and play mixed as the co-host was in total fangirl mode taking selfies with Lopez. “Hoda was so excited to see J Lo and was saying her outfit was channeling her inner J Lo,” a partygoer tells PEOPLE.

Nearby, Kelly Osbourne was spotted limping, she broke her right foot before Christmas. “She loved her walking cane and excited to see J Lo but so over having a hurt foot.”

It appeared Osbourne and Rebel Wilson‘s love notes failed to woo Justin Bieber to the after-party.

Bieber, 21, was a couple of miles away at Light nightclub inside the Mandalay Bay for a boys’ night out. Donning his new purple do, the singer sipped on 50 Bleu and 1942 Don Julio as Baauer and Ty Dolla $ign performed for the hyped crowd.

A-listers also in attendance at Lopez’s first show were Gina Rodriguez, Rosie Huntington-Whiteley, Wilmer Valderrama, Ryan Seacrest, Mario Lopez and special performers Pitbull, Ne-Yo and Ja Rule.

“All I Have” is slated for 40 shows throughout 2016 and for the next three years.

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