Britney Spears has voluntarily checked herself into a treatment facility after she was arrested on suspicion of driving under the influence (DUI) last month, according to a representative for the 44-year-old pop star. Spears was placed under arrest on March 4 around 9:30 p.m. local time after being pulled over by the California Highway Patrol in Ventura County.She was released shortly after 6 a.m. on Thursday, March 5, law enforcement confirmed. 2:50 Britney Spears released from hospital after DUI arrest The Toxic singer's arrest was listed as a "cite and release," with no probation listed.