There is a raging war among 3 Las Vegas properties to snag Britney Spears as their headliner ... TMZ has learned.

TMZ broke the story last week ... Britney was in serious negotiations with one of the Caesars properties to perform several nights a week on a regular basis, as well as make regular appearances at several clubs and pool events.  Well, we just found out ... since we posted our story two other properties -- at least one not associated with Caesars -- have thrown their hat in the ring.

There's a story out that Britney has already inked a $200 million, 2-year deal with Caesars.  WRONG.  No deal has been signed.

But as we reported .... sources connected with the negotiations tell us ... Britney could get $100 mil a year and maybe more.  That's what Celine Dion made and Britney could be an even bigger draw.