CAA has signed Justin Theroux. The actor/screenwriter, who’d been repped by UTA, will next be seen starring opposite Jennifer Aniston and Paul Rudd in the David Wain-directed comedy Wanderlust. Theroux’s recent writing credits include the Adam Shankman-directed musical Rock of Ages, which just started shooting, and Iron Man 2 and Tropic Thunder. Theroux made his directing debut on Dedication, which starred Tom Wilkinson and Billy Crudup. Theroux continues to be managed by 3 Arts Entertainment’s Nick Frenkel and Michael Rotenberg.