So far, we know a few things about Jennifer Aniston and Justin Theroux's super-secret August wedding: Many famous friends were in attendance (but not all of those friends), the wedding band is an understated, diamond-encrusted gold ring designed by Jennifer Meyer, infamous photographer Terry Richardson was the only wedding guest allowed to bring a camera, and the FOMO-inducing Bora Bora honeymoon that followed was essentially a traveling party with close pals Chelsea Handler, Jason Bateman, and maid of honor Courteney Cox. But just in case that wasn't enough to officially induct the newlyweds into the cool couples hall of fame, comedian and wedding attendee Whitney Cummings has revealed that the couple's first dance as newlyweds was not to a corny and overused ballad. Oh no. It was during a live performance of Sia's hit song, "Chandelier." Talking to Andy Cohen on Watch What Happens Live Sunday night, Cummings confirmed rumors that Sia performed at the wedding, calling the singer's appearance — in what is surely the most understated review ever — "pretty good," People reports. Joking that she was the least famous person there, the comedian also told Cohen that guests were invited to the low-key wedding-ceremony-disguised-as-a-birthday-party by a simple email. And in case you were wondering who had the most fun with the event's open bar, Cummings' answer was clear and succinct: "Me." Which leaves us with just a few lingering questions: Did Sia show her face during the performance? Did Kristin Wiig make a surprise cameo (because, amazing)? And can we have a drink with Whitney Cummings sometime? She sounds like a good time.