They've been spending lots of time with each other, sleeping over at each others' places, and they like going out sans panties – could there be more than just friendship between Britney Spears and Paris Hilton?

Don't think so. The two galpals are just "friends," as MSNBC's The Scoop reports, and any speculation to the contrary is "silly," says Paris' rep Elliott Mintz. The buzz started when Paris was snapped stroking Spears' upper thigh, and then Paris was seen kissing another woman, raising eyebrows – and expectations.

Meanwhile, if Paris thinks she's got Stavros Niarchos on the hook, she might want to think again. Friends confirm that, despite her wearing a fake diamond solitaire on her left ring finger, the pair are not engaged. And, according to Page Six, Stavros' parents "have no intention of even meeting" Paris. They think she's "tacky," a feeling shared by Dreamworks honcho Jeffrey Katzenberg, whose son is dating Nicky.