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