Eva Mendes Eva MendesWondered why you haven't seen much of Eva Mendes recently?

Well, it's because she's been in rehab for several weeks.

The 33-year-old actress is in Utah battling what is believed to be a substance abuse problem.

However, there are no details as to what that substance is.

She's at the famous Cirque Lodge, which also recently treated Lindsay Lohan.

Her rep released a statement saying: "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.

"Out of respect for Eva's privacy, we do not wish to discuss further details."

View our gallery of stars who've done rehab.