Last night, Carine Roitfeld celebrated the September “Icons” issue of Harper’s Bazaar with a black-tie cocktail at the Plaza attended by everyone from Nicki Minaj and Kate Upton to Lady Gaga’s French bulldog and co-cover girl, Asia. Gaga herself — whose live jazz performance included several tracks from her upcoming album, accompanied by Tony Bennett — showed up in a heavily slitted Alexandre Vaultier Couture tuxedo dress, accompanied by her boyfriend, Taylor Kinney. Other guests included Kendall Jenner, who looked very slinky in an ivory silk gown with an asymmetrical train, Joe Jonas, who, intriguingly, opted for an all-black suit-and-shirt combo, a bare-chested Dustin Yellin, and Jeremy Scott, who sported a cheerful pair of smiley-face loafers. Click through the slideshow for these and more style highlights from last night’s party, including Linda Evangelista, Crystal Renn, Donatella Versace, and more.