'Pretty Little Liars' casts Aussie actor Lachlan Buchanan

Whenever there's a new guy in Rosewood, it tends to spell trouble for the "Pretty Little Liars" ladies, and we're guessing this time is no different.

Australian actor Lachlan Buchanan has snagged the recurring guest role of Duncan, Zap2it has confirmed. He'll appear in at least two episodes (maybe more!) when "Pretty Little Liars" returns in 2012. Duncan is the latest hottie who Aria, Emily, Spencer, and Hanna encounter as they unravel Alison's secrets.

24-year-old Buchanan is well known to Australian audiences as Charley on "Blue Water High," among other TV roles. U.S. fans know him best as Scott from the CMT sitcom "Working Class."

"Pretty Little Liars" returns to ABC Family on Monday, January 2 and 8 p.m. EST.