Paris Hilton Photo by: X17
Paris's Hawaii Lovefest | Paris Hilton
Paris Hilton knows at least one rule of dating: Get in good with the family. While vacationing in Maui, she partied with boyfriend Stavros Niarchos's sister at the Grand Wailea's club Tsunami. The ladies held hands and danced together throughout the night, but there was still plenty of Paris to go around. Niarchos joined the heiress on the dance floor and "spun her, twirled her upside down, and kissed her," says a source. "They laughed and had a great time." Also at the club that night: Hilton's sister Nicky and her boyfriend, Entourage star Kevin Connolly, and Mischa Barton's ex, Brandon Davis.

Brittany's Sexy Song

Brittany Murphy is putting the finishing touches on the "super-sexy" dance track "Faster Kill Pussycat" for top deejay Paul Oakenfold's upcoming album A Lively Mind. "She sounds like a sex kitten," says our insider. And this isn't Murphy's first time behind the mic. Besides voicing the character Luanne on FOX's King of the Hill, she fronted the '90s band Blessed Soul with Six Feet Under actor Eric Balfour and sang a Carly Simon tune for her 2004 movie Little Black Book.

Caught in the Act

• Haylie Duff, buying Say It with Suds shower gel for sib Hilary at Not Soap, Radio's West Hollywood boutique. Her message on the bottle? "You're the Greatest Sister." Then Hilary – who's dating Good Charlotte's Joel Madden – went to the store and bought a "Rockstar's Secret Girlfriend" message tee.

Paris's Hawaii Lovefest| Brittany Murphy, Paris Hilton, Kanye West
• Kanye West, loading up on Louis Vuitton goodies on Rodeo Drive in Beverly Hills.

• Jerry Seinfeld and wife Jessica, taking a break from the slopes and eating salads at the Cliffhouse Restaurant at the top of Buttermilk Mountain in Aspen.

• By CARRIE BORZILLIO-VRENNA and KRISTIN HARMEL