Credit: Steve Granitz/

After more than 30 days in rehab, American Pie actor Chris Klein has decided to extend his stay.

"Chris, along with his support team, has decided to extend his treatment," his rep tells

No word on how long Klein, 31, will remain at the Cirque Lodge in Utah., where he checked in June 21 shortly after his second DUI arrest June 16 (his blood alcohol level was three times the legal limit of .08).

Says his rep, "He is doing fantastic and is optimistic about his future. He thanks everyone for their continued support."