TSA Takes Big Gulp Over Britney

11/3/2009 1:37 PM PST

TSA Takes Big Gulp Over Britney

UPDATE: TMZ spoke with a TSA rep who was on scene, who tells us, "There were ice chips in the cup, and that is permitted."

Britney Spears
did what no one else we know has ever done at LAX -- she took a Big Gulp-esque drink through security and drank with aplomb as she walked to her plane.

We contacted a security specialist from the TSA who told us screeners have "discretion" when it comes to letting liquids through security.

But we've never met anyone who's ever been able to get anything close to a Big Gulp size of liquid through security.