Not long ago, there was much talk of Mary-Kate Olsen smooching her grungy-cute artist boyfriend at Paul Sevigny’s Beatrice Inn. Now it seems her twin sister, Ashley, whose autumnal fling with Lance Armstrong was splashed across the gossip pages, has once again been nibbling from her own piece of the make-out pie.

Ms. Olsen, 21, and Jared Leto, 36, who dated for a spit in 2005, arrived hand-in-hand at the Art of Elysium gala in L.A. “They looked like a couple and they were making out,” an eyewitness told the gossip weekly Us. But before anyone jumps to conclusions about the pair, a source close to Ms. Olsen claimed that they “aren’t back together. They’re just friends.”