Eva Mendes in Rehab

Eva Mendes has checked into rehab, her rep tells Usmagazine.com.

"Eva has been working hard for the past year and made a positive decision to take some much-needed time off to proactively attend to some personal issues that, while not critical, she felt deserved some outside professional support," her rep tells Us in a statement. "Out of respect for Eva's privacy, we do not wish to discuss further details."

TMZ.com first reported that Mendes, 33, is battling a substance abuse problem and has been staying at Utah's Cirque Lodge -- where both Lindsay Lohan and Mary-Kate Olsen were treated -- "for several weeks." The actress, who was last seen on the big screen in October's gritty crime drama We Own the Night, was recently tapped to appear in an upcoming ad campaign for a Calvin Klein fragrance. She is expected to be featured in print and TV ads this fall.