Nick Lachey and Vanessa Minnillo have reportedly hit a rough patch.

Rumours began circulating that things weren’t as rosy with Lachey and his girlfriend, MTV VJ Minnillo, in January. Reports surfaced that Minnillo was drunk on New Years Eve, which caused Lachey to get upset at his girlfriend of almost a year.

Then it was reported a few weeks ago that Vanessa exploded at Nick after she found some girls trying to chat him up at a club. Vanessa apparently stormed out and he followed her.

Now it has been reported over the Grammy weekend that the pair had another tempestuous weekend. The pair started off all smiles as they entered Justin Timberlake’s pre-Grammy concert on Friday night. However, things took a turn for the worse when Jessica Simpson’s former assistant and best friend Cacee Cobb showed up with her boyfriend – Scrubs star Donald Faison.

"Cacee ran up to chat with Nick like four or five times throughout the evening, while her boyfriend was hanging in the balcony," Perezhilton.com quotes a source as saying. "Vanessa was pissed that Cacee kept coming up to chat with Nick so much. Nick kept having to calm Vanessa down all night."
[Via entertainmentwise.com]