Nick Lachey looks totally hot when he's pissed off!  TMZ.blog reports that Nick was all hot and bothered because someone bumped into his girly girl Vanessa Manillo at a Kentucky Derby party.

According to Nick (via his reps), 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. Dude! Don't push a lady 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.

Nick and Vanessa were in town for the Derby with everyone from Kevin Federline to the Queen of England.