Kirsten Dunst is denying a romance with Drew Barrymore's ex boyfriend, Justin Long, claiming the rumor is "the funniest thing on planet earth".

Kirsten, who has been photographed with Justin Long several times this summer, is claiming she's only met him once, telling Harper's Bazaar: "I don't know him from Adam."

LATimes Blog points out: Funny. Then how does she explain Us Weekly's report of Dunst at Long's home (a sleepover), a concert in Hermosa Beach and a lunch the next day at the Chateau Marmont, after which Long got a room at the hotel?

Still, the actress maintains: "I met him once, and he and his friend were kind enough to walk me home. I've never seen him since."

Interesting...