Worrying picutres of Lindsay Lohan and Nick Lachey’s girlfriend Vanessa Minnillo playing with kitchen knives after a night out have been published.

In one shocking snap Minnillo holds a knife to Lindsay’s throat as she pulls down her vest top with the other hand, whilst Lohan poses with another knife in her mouth.

Minnillo, who has recently moved in with Jessica Simpson’s ex-husband, now says she regrets posing for the pictures, which were taken at Sean Lennon’s apartment following a night of partying in New York last June.A source tells US Weekly, “She got caught up in the moment and thought it would be fun. It was stupid and she regrets it. They were only fooling around."