TMZ has learned Dr. Phil's visit with Britney Spears was not exactly as advertised.

People on the 7th floor at Cedars-Sinai Medical Center say the Doctor arrived at about 7:30 AM Saturday. We're told Britney did not invite him in; she didn't even know he was coming. Sources say it was Brit's parents who told Dr. Phil to go to the hospital. When he walked into her room, we're told, a blindsided Britney walked out and eventually came back.

Sources say Phil tried speaking with Spears for about 15 minutes - not an hour as Dr. Phil's press release states - but she wanted none of it. We're told Phil was doing almost all the talking. As for walking with her to the car on her way out - again as his release states - we're told, if he was walking behind her, that's news to her. She absolutely was not accompanied by him.

Sources say Dr. Phil somehow convinced Brit's mom and dad to be on his show, which will tape Monday and air Tuesday (it was just moved up a day), but, as one person put it, "Based on the interaction between Dr. Phil and Britney this morning, it'll be a cold day in hell before Britney goes on his show." We're told she absolutely will not appear on the program.

Sources say Dr. Phil wants to do a television intervention, something that isn't sitting well with some of the people who have known for a while that Britney has a very serious mental condition - likely a bipolar disorder that is now in the red zone.

TMZ contacted Cedars to find out why the hospital let a television doctor on a floor that has such fragile patients, particularly since Britney had no idea he was coming. It's especially troublesome that Cedars let Dr. Phil go uninvited to Britney's room, since she had already been discharged and presumably had a right to know if someone wanted to visit. A Cedars rep made it short and sweet, telling us "No comment."

A rep from the "Dr. Phil" show had no comment as well, other than "Dr. Phil met with Ms. Spears at family members' invitation."

INF

According to Page Six Britney drove around aimlessly on Saturday.

After returning home from the hospital earlier this morning, Britney Spears is back on the road.

Just eight minutes ago, the brokendown pop wreck left her Beverly Hills mansion in her white Mercedes, saw photographers and turned in the other direction.

Currently, she's driving aimlessly near her house.

Brit is doing whatever she can since being released to avoid the paparazzi.