NOW, we're being told Brit and Adnan are headed back to the US! Why in the world they'd go to Rosarito and then turn around and come home is beyond me, but there's no telling with Bonnie and Clyde!

Here's another thing -- a source close to Britney has told us she does NOT have a passport. The US requires one to get back in States or an 'enhanced' drivers license, which I would highly doubt Brit has.

Trouble in paradise?