The Hoff's Ex In the Slammer

4/29/2010 6:05 PM PDT

pamela bach, david hasselhoff's ex wife goes to jail

TMZ has learned Pamela Bach has turned herself in and has begun serving a 90-day jail sentence.

TMZ broke the story David Hasselhoff's ex was sentenced last Friday after pleading no contest to a DUI.  As a result of the plea, she violated her probation in an earlier DUI case.

Bach was supposed to turn herself in next week but obviously couldn't wait.