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Is Justin cheating on Jess with another woman? And why did Jessica move her pup out of the love nest she shares with the former 'N Syncer?!

While we'd like to give him the benefit of the doubt, after reading those Rihanna rumors last week, and now seeing him leaving the Beverly Hills Hotel with another woman (who was wearing a wedding ring, no less!), we kinda gotta wonder!

After lunching with this mystery gal, Justin went to play golf with his friends at the green in Toluca Lake. Earlier that morning, Justin's assistant took his dogs for a walk, but our photographers noted that it was just his canines and not Jessica's pit bull Tina! This is the first time in a year we've seen JUST JT's two dogs out and about, and it appears as though Tina is no longer living at casa de Timberlake! If this isn't a sign that the breakup stories were true, we don't know what is!

Jessica's willing to climb Mount Kilimanjaro to be close to her man, but is it enough to stop him from stepping out on her with another woman - a married woman, who clearly didn't want to be caught with JT?