By Tatiana Krisztina Zoe Gregory, a former Playboy model, claimed that Justin Timberlake cheated on Cameron Diaz with her at Hugh Hefner’s grotto. The two reportedly met at a party at the infamous grotto. Zoe alleged that she and the Sexyback singer hooked up at that same party. This isn’t the first time that Justin has been accused of infidelity, though Zoe made it clear in her interview the two never had sex and only “fooled around.” In her memoir released last year, Britney Spears went into detail about her relationship with Justin in the early noughties, accusing him of cheating on her. Fo…