While Zac was away in Europe promoting Hairspray, Vanessa was at a Hollywood Hills party, where eyewitnesses say she was "all over" her older, not-Zac date.

And when someone dared to ask about Zac, Vanessa "threw a fit and said 'don't mention his name!' "After his return home to L.A., the pair were spotted Sunday night driving together in Zac's car, though the mood looked anything but festive.

I so don't care about this fake couple, but Vanessa fans do love this site.

ok magazine