Kirsten Dunst has laughed off speculation she is romancing Justin Long, insisting the rumours "are the funniest thing on planet Earth".The Spider-Man star has been repeatedly photographed with Long over the summer shortly after he announced his split from actress Drew Barrymore in July.But Dunst insists she is currently single - and has only met Long once.She says, "I don't know him from Adam. I met him once and he and his friend were kind enough to walk me home. I've never seen him since."

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