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In Touch has an insider story about a scene that went down between Britney and another woman at Cedars-Sinai last week. After being admitted under the name Barbara Jean, Britney was apparently "thrashing into a wall" and cut her head, which led her to be taken from the 3rd floor Psych Unit to the 8th floor.

It was there that another patient's mother brought in a birthday cake for her daughter, but was told that having food was against the rules. The mom screamed: "If Britney brought the cake you'd let her!" She then kicked the door to Britney's room, causing Brit "to yell back." Talk about a ruckus!

And while Britney declined to wish the woman's daughter happy birthday, she did "sneak a few cigarette breaks." Do you think the patient's mom had a right to be angry?

Also, here's a Britney update! Our girl is on the move again - she's left her Beverly Hills home and stopped for gas... pix coming soon!

X17 will keep you informed of all Britney news just as soon as we get it!