February 21, 2007 12:00 PM

A day after entering Promises, a residential rehab facility in Malibu, Britney Spears has checked out of the treatment center, a source confirms to PEOPLE.

“It was against their advice,” says the source. “If she comes back for treatment, Promises will have to assess the situation. Sometimes people come back, but it doesn’t look good.”

After checking out, Spears arrived at the Bel-Air Hotel on Wednesday. When asked by PEOPLE how she was doing, she replied, “Great. I’m great.”

Promises is not a locked-down facility, so a patient is able to leave the program if he or she wants to.

Spears checked out of the rehab facility because, the paparazzi turned it “into a media circus over there,” another source tells PEOPLE. “She is going crazy and they still won’t leave her alone, even in rehab.”

Entertainment Tonight and TMZ.com were first to report that Spears had left rehab.

On Tuesday, Spears’s manager, Larry Rudolph, told PEOPLE the singer had “voluntarily checked herself into an undisclosed rehab facility today.”

Over the weekend, Spears, 25, shaved her head, got two new tattoos and was spotted partying in West Hollywood.

Last week, she visited Eric Clapton’s Crossroads Centre in Antigua but left after just one day and headed to Florida, a source told PEOPLE at the time.

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