It was a battle of the exes at Us Weekly’s “Most Stylish New Yorker” party the other night at Avenue. Kanye West‘s ex-fiancée, Alexis Phifer, and his current flame, Amber Rose, both showed up “rocking all-black, skin-tight clothes and cropped ‘dos,” said our spy. “They were seated across the room from each other, but in direct eyeshot. They kept throwing each other dirty looks all night.” Well-behaved guests included Alicia Keys, Ivanka Trump, Martha Stewart and Christie Brinkley.