EXCLUSIVE: Jennifer Lopez and Marc Anthony's Marriage at "Breaking Point"

The new issue of Us Weekly, on newsstands tomorrow, reveals the behind-the-scenes crisis going on in Jennifer Lopez's third marriage to Marc Anthony.

Rumors swirled that Lopez's marriage was on the rocks after she showed up to the premiere of The Curious Case of Benjamin Button last week without her 8-carat diamond engagement ring, wedding band - or ever present husband, Marc Anthony (who was spotted in Las Vegas sans wedding band the weekend before).

Multiple sources confirm to to Us Weekly their marriage is at a breaking point.

"They both didn't wear their rings on purpose," a mutual pal of the married couple of four years (who renewed their vows in October) tells Us. "Nothing Jennifer does is without purpose."