Guess it wasn't true love!

After nearly two years together, True Blood's Alexander Skarsgard and 21 actress Kate Bosworth have called it quits, Us Weekly has confirmed exclusively.

"It was very mutual," a source tells the new issue of Us (on newsstands Wednesday). "And it happened a while ago."

While Bosworth, 28, was photographed giving her ex, Orlando Bloom (now married to Miranda Kerr) a friendly hug on July 7, her Straw Dogs costar Skarsgard has been embracing his freedom.

During a July 21 Film District bash at Comic-Con in San Diego, the actor, 34, flirted with a brunette -- and left the party with her.

"He's single," confirms a source, "and he is loving the attention!"