By Nicole Guanlao and Whitney Benta

During the show, Gaga gave a shout-out to her good friend Marc Jacobs. Marc wasn't in the building, but his presence was definitely felt: For Gaga's fifth outfit change, Jacobs created custom Louis Vuitton Graffiti leggings for her dancers, and Gaga rocked a pair of Louis Vuitton stilettos to match. One day we only hope to have friends that design for Louis Vuitton -- clearly Lady Gaga is having the time of her life!

Not only can she pull off the craziest styles, but she's quite the performer too. She sounded great live and talked to the audience throughout the show, prompting the already-hyped crowd to go wild (one classic quote among many: "Do you know how many times I played clubs in this city and they threw beer at me? It was kind of fun"). The venue was packed with screaming and jumping Gaga fans, and we felt like sardines in there. In between fending off people pushing and shoving their way to get to the front (we even encountered a guy dressed up as a pig!), we couldn't help but look up to the VIP balconies in an effort to catch a glimpse of Gaga's A-list concertgoers.

And just who did we spy? Pop's queen bee herself, Madonna, and fashion designer Zac Posen were among the VIPs. We also caught a glimpse of '80s icon Cyndi Lauper, who like Lady Gaga was known for some flashy and bright outfits in her heyday. It also felt like two pop queens were passing the torch onto pop's newest princess ...