Supermodel Naomi Campbell, Vladimir Doronin OD on PDA

Sunday, November 30th 2008, 4:00 AM

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Naomi Campbell has no qualms about engaging in PDA with her billionaire beau Vladimir Doronin.

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Get a room, Naomi!!! That's what guests on the beach outside South Beach's posh Setai hotel were muttering this weekend as Naomi Campbell and her Russian billionaire beau Vladimir Doronin refused to keep their hands or their lips to themselves in public.

The pair kissed and cuddled like newlyweds, doing absolutely nothing to dispel engagement rumors, especially because Campbell kept flashing an emerald and diamond ring Doronin had just bought her.

A promise or just a pretty present?

The catty catwalker is in town for the Art Basel festival and to attend Tuesday night's "In Fashion Photo" expo, a retrospective of more than 50 photographs and illustrations of her from the past 20 years.

Campbell was expected to throw her after-party for the expo at the Cipriani sales center in the former Saxony hotel, but she was dissuaded by the restaurant's current legal woes. Instead, the bash will be held at SET nightclub down the street.

Cameron squeezes past rival
Cameron Diaz may have moved on from Justin Timberlake, but that doesn't mean she wants to come face-to-face with his current squeeze, Jessica Biel.

Diaz famously flipped out at Biel after the 2007 Golden Globes, causing a scene at the Beverly Wilshire hotel.

Now, almost two years after that tussle, Diaz rushed in and out through the backstage entrance for Friday's CNN Heroes All-Star Tribute at the Kodak Theatre in Los Angeles, avoiding Biel, who was also presenting an award. "It was a careful tango to make sure they weren't backstage at the same time," our spy reports.

Biel seemed like she could care less about running into Timberlake's former gal pal — maybe because she had a new guy on her arm: Jessica brought along her silver fox dad Jonathan, who was so handsome he was mistaken for Giorgio Armani all night long.

Speaking of Justin, we hear he is the one guest his other ex — Britney Spears — hopes will show at her 27th birthday bash and album release party Tuesday night at Meatpacking club Tenjune.

Ranger keeps his cool
Not all professional athletes are professional jerks. Ranger Scott Gomez was a perfect gentleman during a recent team dinner at Primehouse. Gomez and the boys in blue were hanging by the bar when a boozed-up lady began sloppily hitting on him, stumbling and knocking over glasses to the dismay of other diners.

After about 20 minutes of her antics, Gomez patiently walked her to a cab (which she ran into face-first), paid the driver and sent her on her way. Patrons, who had all gathered at the window, burst into applause when her cab sped away. Gomez did a little bow.