Britney's New Vegas Performance

10/1/2007 3:46 PM PDT
Sloppy drag Britneys are all the rage these days ... and TMZ's found the most reviling one yet.

Jeff Beacher, the madman behind Beacher's Madhouse at the Hard Rock, did his best Spears impression over the weekend ... and it was not a pleasant sight.

Warning -- this video NSFAWHJE (not safe for anyone who has just eaten).