Britney Spears has checked into a rehab facility for substance abuse, reportedly weeks after being arrested for driving under the influence. The timing of the rehab check-in and the DUI arrest is not entirely clear, with some reports specifying it occurred within a few weeks, while others mention a longer timeframe. Spears' DUI arrest apparently occurred prior to her rehab check-in, but details of the arrest, including her behavior during the incident, are emerging.