Turns out the romance wasn’t that serious between Jeremy Piven and Erica Lancellotti — their short fling is over already, with friends saying she talked about it too much. Attractive brunette Lancellotti confirmed to us over the holidays that she and the “Entourage” star had been dating for about six months. (When we asked if it was serious, she replied flippantly, “Is anything ever really serious these days?”) But after our story ran, Piven jetted to Florianopolis, Brazil, without her to party on New Year’s Eve. We’re told Piven was peeved that Lancellotti filled us in on their relationship, and they got into a “huge fight” about it. Piven dumped her shortly after. “He was super-pissed she was using him for publicity and wants nothing to do with her,” a source told us. Another source said her relationship with “American Idol” host Ryan Seacrest also ended after Lancellotti spoke publicly about it. A rep for Piven didn’t get back to us. Lancellotti responded that our story was “not true nor accurate.”