Model Sarah Harris described said she was touched by Bieber in an interview on Australian radio. She says Justin was allegedly hanging out with Kylie Jenner at a Playboy party when one of the models working the event grew upset that he refused to take a picture with her.
The model got her colleague to back off, when Bieber allegedly "thanked" her by grabbing her breast, causing her to instinctively backhand him. Playboy has denied that the incident took place.
Sarah has slightly downplayed the story, claiming that it was more of a misunderstanding. Some are saying that's just because Beliebers have ripped her a new one online.
There are also reports that another woman was drugged at a different party held in Justin's recording studio. You can read more about that, here.