Last week, Jessica Simpson was spotted having dinner with her mom, BF Eric Johnson and some friends. Little did she know that she would be sitting about 3 tables down from her ex-husband, Nick Lachey, and his longtime girlfriend, Vanessa Minnillo.

At first, we heard that the parties kept to themselves, without much to-do or bother. Now, we’re hearing someone was spewing sour grapes at the far table – and it wasn’t Nick!

Sources at the restaurant overheard Jessica get nasty with her server, saying: “I hope Vanessa likes her clothes because I bought them for her, since Nick took all my money.”

Ouch! Low blow! True, but still…

Then, another patron at the place confessed to seeing Jessica get really drunk, “drinking margaritas and doing shots of tequila,” all because she couldn’t deal with Nick being so close to her. The whole encounter was described by one source as “weird” and “awkward”.

Wowza. It’s been five years now. You’d think she’d have moved on by now!