Tim Mosenfelder

Ultra Music Fest has attracted the biggest names in dance music to Miami this weekend. But on Saturday night the biggest of them all, Her Madgesty, made a surprise appearance: Madonna joined Swedish DJ-producer Avicii onstage to debut his remix of her new track "Girl Gone Wild." Watch video evidence below.

Madonna took the stage first to introduce Avicii. She said, "I've been here [Ultra Fest] in spirit for many years, but it's good to finally be standing on the stage." She added, “In my world, the words ‘music’ and ‘dance’ are not separated ok?" then cracked a joke about--what else?--ecstasy. "Who has seen Molly?" she quipped. Molly, of course, is a reference to ecstasy, whose chemical name is MDMA, which Madge used as source material for her drug-nodding new album title, MDNA. Get it? Madonna: What a jokester.

Word out of Miami says Madonna rolled up to the festival in a three-car motorcade, led by a police car. After her one song onstage, she posed for a pic backstage with super star DJs like David Guetta (see it right here), then her entourage loaded into their cars and drove back to Madonna's secret dance kingdom in the clouds (read: her hotel room, probably).

Watch video of her appearance onstage, below. Then tell me what you think in the comment section.