Two different branches of the art world collided in Paris on Tuesday night, when Francesco Clemente and Terence Koh debuted a joint show of their new work at Galerie Thaddaeus Ropac. Clemente showed elegant watercolors, whereas Koh debuted a live opera in which he performed covered in white paint, white crystals, and white powder, screaming and crying as he crisscrossed the gallery and wound up in the street. There was a similar disparity in the artists' posses: Clemente had the refined Euro crowd covered (wife Alba, Georgina and Coco Brandolini, Natalia Vodianova); Koh had half of downtown Manhattan in tow (Michael Stipe, Mary-Kate Olsen and Nate Lowman, Vito Schnabel). Not that the worlds of Koh and Clemente are that alien to each other, of course. "I love what Terence does," Clemente, a longtime downtown fixture himself, explained at the post-show dinner in the grand salon of Maxim's. "And there's actually quite a bit of crossover."

There was certainly plenty of crossing over when the party moved to the upstairs dance floor at Maxim's and the likes of Alexia Niedzielski, Margherita Missoni, and Eugenie Niarchos arrived following a private dinner for Giambattista Valli at Kaviar Kaspia. At the center of the action was Koh. "I've been in Paris all month working on the performance, going to the opera almost every night, and pushing myself," he said. "But tonight I'm ready to celebrate." While he was speaking, Vodianova came over and asked him to send her pictures, as she had missed the performance earlier. Better yet, could he just redo it now? "Sure," he smiled. "But it will take me another month to prepare. Can you wait that long?"

— Derek Blasberg