Water is wet, the sky is blue ... and Amy Winehouse has checked into rehab once again.
Winehouse is now seeking treatment for "alcohol addiction" at the Priory Clinic, a prestigious UK rehab center.
Amy's people released a statement saying, "[Amy] wants to be ready for performances in Europe this summer and decided to seek an assessment. She will remain at the Priory on doctors' advice."
According to reports, Amy's issues are so bad ... she even drank a small bottle of vodka on her way to the facility Wednesday.