Lindsay Lohan's knife pal, Vanessa Minnillo, regrets her behavior with the young star, according to reports. Pictures of Lindsay holding a knife to Vanessa's neck (the photo) and the pair pulling at each others' tops last June were leaked onto the internet last week. But Minnillo, who is now dating pop star Nick Lachey, is allegedly ashamed by her behavior, which took place after a night out at New York club Bungalow 8. A source tells Us Weekly magazine, "Minnillo got caught up in the moment and thought it would be fun. It was stupid and she regrets it. They were only fooling around."