Lindsay Lohan Leaves Betty Ford ... for Malibu Rehab Center

Lindsay Lohan has CHECKED OUT of the Betty Ford treatment center near Palm Springs ... and has entered the Cliffside rehab center in Malibu ... TMZ has learned.

Sources familiar with the situation tell us ... the move was APPROVED by the prosecutors, the judge and Lindsay's lawyer.

The gang agreed ... Betty Ford is better suited for a 30-day program, which Lohan has completed -- and she'd be better off completing the remainder of her 90-day sentence at a new place.

We're told ... they all agreed Cliffside in Malibu would be beneficial for Lohan and everyone signed off. She checked out of Betty Ford yesterday ... and is already settling in at Cliffside.

We don't know if Lindsay will be allowed to take Adderall at Cliffside ... but one source says, "It's doubtful."