The invite to Lady Gaga's masquerade ball at the Guggenheim last Thursday night read "Head Accessory Required: Mask, Hat, Tiara or Lobster." That was no problem for the insiders and celebs, like Marc Jacobs and Yoko Ono, who showed up in headgear ranging from devil horns to bunny ears. The soiree celebrated Gaga's first fragrance, Fame, a black eau de parfum that turns clear when spritzed. Although the guest of honor didn’t sing, her Sleeping With Gaga performance art captivated the audience. While Gaga "slept" the night away in a massive fragrance bottle, guests enjoyed every waking moment.

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