A wandering eyed Nick Lachey was caught by his girlfriend Vanessa Minnillo, when she saw him canoodling with a Jessica Simpson look-alike at Plumm nightclub.

The pop singer and Minnillo had come to the club to catch Joey McIntyre's performance, was seen with his ex- wife's look-alike who signalled him to call her as she left the place, forcing the MTV host to jump onto the scene demanding an explanation.

"What are you doing? We need to talk, " TMZ quoted her, as telling a dismayed Lachey.

The 'Shut Up' singer obediently followed his ladylove, who was seen taking a cab to leave the place, while Lachey was standing alone on the sidewalk.

Then the two exchanged heated words in the cab, as he caught up with her and the couple left in the same cab.

An eyewitness has said that the couple was not going spit up over the issue.