Comedian Jerry Seinfeld is pleasant enough, but since the publication of his No. 1 book “SeinLanguage,” his face has enjoyed a ubiquity Saddam Hussein can only dream about. He’s got his own show, a glut of American Express ads, even a recent Playboy cover. Now he’s leering at passersby from bookshop windows everywhere. Seinfeld’s countenance is already being nosed aside, however, by bad-boy broadcaster Howard Stern, who’s been mercilessly flogging his new book “Private Parts.” Stern’s anatomically correct humor has already Propelled the memoir to the top of next week’s New York Times best-seller list.

Why not? Talk-show host Kathie Lee Gifford has been regaling fans with her brand of in-your-face obstetrics for years. Last Monday, three weeks before Halloween, Gifford frightened Letterman fans with a hauntingly cheesy rendition of “Winter Wonderland, one of the tunes on her upcoming Yuletide album. Missed it? Fear not. There are still at least 40 “Arsenios” until Christmas.

That’s plenty of time to push the album, and maybe even to christen yet another Planet Hollywood eatery. The latest opened in Washington two weeks ago, affording beefy actor-restaurateurs Bruce Willis and Sylvester Stallone a fresh chance to mug for the cameras while promoting $7.50 burgers. A low note: Willis stripping down to muscle-T and boxers to sing the blues.

But even this has nothing on perennial exposure-champ Sharon Stone. Without a current project to plug, she sashayed into the papers last week modeling a baby-doll wedding dress in Paris for designer Valentino. The “Sliver” star may soon have new competition, though. NBC is negotiating a prime-time special to star kiddie tube-fave Barney. Stone is no slouch, but it’s hard to ignore a purple dinosaur.