Trouble in Nick Lachey’s paradise?

We haven’t heard much from Nick Lachey and Vanessa Minnillo lately, which isn’t surprising since the only interesting thing about these two is that they like to do it in hot tubs in Mexico, which is less interesting than unsanitary, really.

But it appears there may be trouble in paradise. Nick and Vanessa were spotted at LAX arguing all the way through the security line. You can see by the look on Vanessa’s face in this pic she is less-than-thrilled about something — their non-existent careers, perhaps? Onlookers said the dog got more love than Nick. Ouch!