United Kingdom, April 13 -- Britney Spears has checked into rehab.

The 44-year-old pop star's representatives confirmed on Sunday (12.04.26) that the singer has voluntarily entered a treatment facility five weeks after she was arrested on suspicion of driving under the influence of drugs and alcohol (DUI) in Ventura, California in early March.

A source told PEOPLE that Britney made the decision to enter rehab as a way of "moving forward", saying: "People close to Britney encouraged her to seek treatment.

"She understands the seriousness of her situation and felt this was the best step moving forward. She's now seeking treatment."

Another insider told New York Post column PageSix that Britney is determined to put her mental health firs...