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Wouldn't you just kill to have been a fly on the wall for this!!

Us magazine says Justin Timberlake and his girlfriend Jessica Biel were eating dinner at Yatai Japanese restaurant on Sunset Blvd in West Hollywood Monday night, when Britney Spears showed up with her mom Lynne!!! Totally awkward, right!!!

According to the mag's source, Britney wasn't looking her best and probably didn't expect to run in to anyone at this under-the-radar restaurant.

The witness said Justin and Jessica slumped down in their seats to avoid Britney and her mom. Spears left after about 30 minutes without speaking to Justin and Jessica. Justin and Jess left the restaurant a short time later.

While this is a great story, we're not entirely convinced its true. Although Us cites two different sources for the story, our photogs say they saw Britney's car at a dance studio in Burbank at the time she was allegedly nearly running to Justin.