"Extra" has learned that pop star Britney Spears is entering a rehab facility.

Spears was last seen leaving New York City four nights ago on a private jet with her two young sons heading to Miami.

Then, she disappeared off the paparazzi radar. Spears entering rehab comes after months of hard partying and friends having reached out to her to seek help.

Good luck to Brit Brit!

* Thank you Phil!

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