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Our spy inside Justin's concert on Friday told us about a VERY awkward moment at the gig when Joe Simpson walked by Nick and Vanessa's table and said nothing -- the pair ignored Nick's ex-father-in-law and their table froze with silence. Maybe it left Nick a little hot under the collar because when he and Vanessa left, he shoved his car door into a photog (not our guy) with such force he may have broken the camera. Chill, Nicky!