Paris Hilton was spotted waiting for her ride outside of the Grafton Hotel on Sunset yesterday afternoon, and she could not stop giggling as she chatted with Jimmy Iovine at the valet. We're not sure if the music producer was telling her a legitimately funny story or what, but Paris was certainly lovin' it!

We're not even sure who she's dating these days (we thought she was with boxer Wladimir Klitschko, and then there were those Kevin Connolly rumors), but Hayden Panettiere claims she's "just friends" with rumored flame Harry Morton, who she was spotted with less than two weeks ago.

I guess we'll have to take her word for it! Looks like someone wants to keep her options open...

In case you didn't already know, Conan O'Brien is on Twitter, and his followers seem to be growing at an exponential rate.

Over 250,000 fans have added the former NBC Tonight Show host, and according to The Hollywood Reporter, Conan got 1,000 followers a minute within the first three hours of signing up for the micro blogging service.

A bearded Conan posted a picture of himself with a monkey on his back and tweeted, "Today I interviewed a squirrel in my backyard and then threw to commercial. Somebody help me."

While having hundreds of thousands of followers on Twitter may be comforting, it looks like Conan may be getting some serious revenge against Jay Leno sometime in the near future. While Roger Friedman reports that Conan and Fox are actively working on a deal, Conan is also in talks to take his show live to theaters across the country. It would make the comedian more appealing to Fox, and it seems like an announcement about Conan's latest projects could even upstage Jay Leno’s return to the Tonight Show next month. We'd love to see that!

Spotted: Cher (who is finally starting to show her age) and her son Chaz, along with his girlfriend Jennifer at an art show on Melrose last night. Chaz definitely looks comfortable in the pinstriped suit, and he didn't seem bothered by the attention from photogs either. Hard to believe that just a few months ago he was a blonde she!

Nicole Richie was snapped arriving at Les Galeries Lafayette department store in Paris to launch her Winter Kate clothing line, and though the reformed party princess had a bit of a heavy hand when it came to applying her eye makeup, she looks pretty fab otherwise!

William Baldwin palled around with Blake Lively on the set of Gossip Girl yesterday in New York, playing the part of Serena's long lost father.

Lively's character spent a large part of the season looking for her dad while her mom Lily (Kelly Rutherford) was secretly receiving letters from the missing man and hiding them from her daughter.

Baldwin's got some real-life drama of his own ... his wife Chynna Phillips checked into a rehab facility for anxiety just over a week ago not long after her sister Mackenzie went public with accusations their late father John sexually abused her.

Sometimes truth is stranger than fiction!

Casual cottons aren't just for regular folk, the stars like to be comfortable too!

Audrina Patridge patronized the Beverly Hills James Perse store yesterday, just a day after Mrs. Victoria Beckham graced the shop with her presence!

Even old dudes on the street couldn't keep their eyes off Audrina as she strutted her stuff in studded jeans and a loose-fitting, off-the-shoulder t-shirt - HOT!

Rebecca Romijhn and Jerry O'Connell don't let two twin babies get in their way of some Tuesday afternoon couples shopping - and they shouldn't!

The pair left Dolly and Charlie at home with the nanny and hit up the Gap yesterday, enlisting help from a stylist (who looks oddly like Debra Messing!) to choose just the right button-down for Jerry and the perfect-fit jeans for Rebecca.

And you think celebrities get all their clothes for free? Well Jerry tells us otherwise! ...