Leslie Sloane Zelnik — the publicist behind trainwrecks Britney Spears and Lindsay Lohan, just doesn't know what to do with a celeb client that isn't a total fuck-up at all times.

Last Wednesday at the Marie Claire party in Soho, Zelnik told the Lowdown a little ditty about her least whack client, Sarah Michelle Gellar. Apparently Buffy is a total Winona.

"Want to know what she's obsessed with? Chanel black nail polish! It's sold out in the United States. She stole some from someone," uberflack Leslie Sloane Zelnik revealed to Lowdown as Gellar listened at Wednesday's Marie Claire Haute Shopping party in the SoHo loft of financier Henry Buhl. Patting her black shoulder bag, Zelnik added, "I have it in my purse."

We get that Gellar probably needs the press, but can't Zelnik get her on a "save the puppies" organization or something? We're not the expert on this, but she should probably be more focused on keeping Lindsay Lohan out of the bathroom than trying to her other clients arrested.

A polished performance by Gellar [Lloyd Grove, Lowdown]