According to Nick Lachey's reps him and his ho Vanessa Minnillo were at a Club Felt party in Kentucky when some dude approached Nick and he was gonna throw down.

The couple were making their way through the party at Club Felt, led by Nick's bodyguard, when some drunk guy yanked Nick's arm causing Vanessa to fall down.

While Vanessa tried to calm her pissed off boytoy, nearby police took control of the situation and cuffed the guy. They asked Nick if he wanted to press charges, but Lachey and Minnillo were content to just put the night behind them.

Filing a police report would interfere with their banging schedule. Can't stand machismo Nick. If cameras were rolling he probably would have thrown some punches.

source