Britney Fails Drug Test? - X17 Source Says NOT TRUE!

TMZ is reporting that a source informed them that Britney tested positive for one of her court-ordered drug test, but the source also "maintains it was a false reading." Uh-oh!

NOT TRUE!, says an X17 source -- we're told there's been nothing found in any of the tests other than prescription drugs cleared by the court doctor. "No illegal drugs or even alcohol were found in any of the results."

And more rumor control ... some reports say Britney went to see a doctor in Las Vegas this weekend but our sources tells us - NOT TRUE! She was house hunting for homes near Lake Las Vegas and was in a real estate office, not a doctor's office!

More Britney news coming soon! ....