Denials yesterday by Marc Anthony's rep that Jennifer Lopez is pregnant aren't likely to squelch the rumor. Sources close to the singer's camp are buzzing that she's indeed expecting after years of in vitro. Lopez is promoting her new album "Brave" in London, where the tabloids have gone to town with the story. They report that just before arriving at the Dorchester Hotel, Lopez faxed over a laundry list of snacks - including two humidifiers, two fans, a room set at 80 degrees, Jo Malone candles, white or red roses, soft-baked chocolate-chip cookies, sour cream and onion chips, regular chips, veggie platters, plain M&Ms, sunflower seeds, Ritz crackers, Dentyne Ice gum, spicy brown mustard, mayonnaise, Smartwater, caffeine-free Coke and Red Bull. A rep for Lopez said she didn't know if the singer is pregnant.