WB has put out a press release confirming that Jensen Ackles will be joining the cast of Smalleville.

From kryptonsite.com:

In addition to Durance, actor Jensen Ackles will be joining the SMALLVILLE cast as Lana Lang’s (Kristen Kreuk) new boyfriend. Ackles returns to The WB, having appeared on DAWSON’S CREEK for one season in 1998. SMALLVILLE enters its fourth season this fall, airing Wednesdays, 8:00-9:00 p.m. ET.

If you’d like to discuss Jensen’s new role at the forum, Amberglass has opened a thread for it which you can find here.