TMZ is reporting that Octomom Nadya Suleman has checked herself into rehab and is leaving her 14 kids without a mother for 30 days.

So what habit is she trying to kick??  A rep for Suleman has confirmed that Nadya is checking herself into the Chapman House Drug Rehabilitation Center in Southern California over the weekend after acknowledging she's become dependant on Xanax....so she can "deal with stress."

She says she wants to get off of the Xanax she was prescribed by her Dr. and learn to deal with her stress, exhaustion and anxiety with professional help with a team of doctors.  She wants to be the best mom she can be.

So where do the kids go??  There are 14 of them running around.  Well, Octomom is using 3 nannies, and 2 friends to split up the child care duties.  She also has a driver to take the kids to and from school.

So who's paying for the treatment???  Nadya can afford it for sure after all that $$$ she made doing porn, but the rehab facility offered to pick up the tab anyway.