Claire Holt cast as Stefan's vampire ex, Bex

"Vampire Diaries" fans, if you thought Katherine was ten kinds of trouble, get ready to meet Rebecca -- AKA Bex, a beautiful vampire who had the pleasure of Stefan's company back in the early days when he was feasting on human blood.

Fans have been curious about this new development for weeks, and now Zap2it can exclusively confirm that Australian actress Claire Holt has been cast as the former object of Stefan's affection.

Holt can currently be seen on ABC Family's "Pretty Little Liars" as Samara, Emily's new girlfriend (though we don't think those two have updated their Facebook statuses quite yet), and is known to Australian audiences for her work as Emma on "H20: Just Add Water." A few of you may recognize her from "Mean Girls 2," in which she played the not-particularly-bright Chastity, one of the Plastics.

She caught the eye of "Vampire Diaries" executive producer Kevin Williamson while he was casting for his new series, "The Secret Circle."

On "The Vampire Diaries," we'll first meet Bex in flashbacks. She's not going to be just a memory for long, though -- she's never quite moved on from Stefan, and you may be particularly surprised to find out what brings her back into his life.

We doubt she'll have any success if she's looking to hook Stefan romantically. As Paul Wesley told us this weekend, "Stefan isn't thinking about other women in the least bit. He's completely in love with Elena and he's doing this whole thing for Elena."

Ωστε αυτή θα παίξει την Becky τελικά... Ενδιαφέρουσα φαίνεται.