Tiger Woods' Mistress -- The DUI Mug Shot

TMZ has obtained the mug shot for Tiger Woods Mistress #4 Jamie Jungers -- after she was busted in Vegas early Friday morning for DUI.

As we previously reported, Jungers had gotten into a car accident near the strip -- and after cops showed up, they arrested her for driving on a suspended registration, having no proof of insurance, and driving under the influence.

She was taken into custody and has since posted bond.