When you dish celebrity dirt for a living, you're bound to have plenty of famous friends (and enemies) in Tinseltown. And Saturday night, gossip guru Perez Hilton rang in his 31st bday at The Viper Room, surrounded by some his fave boldfacers (including Christina Aguilera, Kim Kardashian, Tara Reid, Amanda Bynes and the Jonas Brothers, who serenaded Perez with that oldie but goodie, "Happy Birthday").

Natch, red carpet regulars Spencer and Heidi were on hand to fete their friend (and milk the photo op), as was fellow Hillzie Doug Reinhardt, who showed up with his main squeeze Paris Hilton.

Happy OMFB, Perez! Now, let's all raise a glass and toast to Mr. Hilton! And, of course, to Dougie and Amanda's awkward/inevitable "Ew, didn't we used to date?!" moment.

Paris Hilton and Doug Reinhardt have been almost inseparable ever since they were spotted hanging (read: giggling like schoolgirls) at a Super Bowl Party early last month. Reinhardt (who recently split from actress Amanda Bynes and briefly dated Lauren Conrad on The Hills) accompanied Paris on a trip to Tokyo last week, and was spotted out in L.A. with P. Hilton again as recently as this past Saturday night.

+ Think this unlikely couple has staying potential? Or are they just in it for the free photo opps? Either way, Speidi better watch their step -- cause Parhardt has the paparazzi's number, and they're not afraid to use it.

Psssssst! Wanna see Paris swing by Hills country to support her new manz? Let us know how you'd feel about seeing P. Hilton in a future episode!

Pictures (almost) never lie. And judging by this ambiguous X17 snapshot, it's only a matter of time before Paris Hilton starts getting cozy with The Hills' very own Doug Reinhardt. Think Paris is getting his digits? Adding him as a Facebook friend? Reading up on the financial crisis at WSJ.com? We're not sure -- but we do know this:

1) Both are single and looking to mingle.
2) Both have (varying degrees of) experience in front of the camera, and ...
3) We saw an awfully similar-looking pic of Dougie and his last gf, Amanda Bynes.

+ Are Paris and Doug making beautiful X-rated music together? Or are they just sharing an innocent Blackberry moment? Let us know whether you guys think there's a cute celebreality coupling in the works!

We figured Amanda Bynes and Doug Reinhardt would be together forever! Or at least until Valentine's Day, (because, really, who wants to bother trying to find a NEW special someone before then?) Sadly, however, it seems we were sorely mistaken on both counts.

Despite the couple's hot n' heavy history of holding each other's knees at Lakers games, it seems that someone (Amanda, obvs) has decided to call it quits. Here's the latest rumor report!

"She ended it. She had had enough," an unnamed source helpfully informs Usmagazine.com. "Her friends didn't trust him. Everyone thought he was using her for celebrity. He was not good, and she was over it. It was definitely her who ended it."

+ Think it's true? If so, do you really care? Share your comments with us -- and while you're at it, tell us whether you'd say "yes" if Doug Reinhardt (or as we call him, "Dud") asked you out on a dream date.

Earlier: Amanda Bynes Gladly Accepts Lauren Conrad's Leftovers

Those of you who are up on your Hills hookup history know that Brody Jenner (a.k.a. Lauren Conrad's BFF and former bf!) hangs with Doug Reinhardt, who briefly dated both LC and her pal Stephanie Pratt (deny it all you want, guys!)* before shacking up with his current girl, Hairspray hottie Amanda Bynes, who -- as some of you pointed out -- bears an uncanny resemblance to one Steph Pratt!

So, all things considered, what's Brody's take on Doug and Amanda's three-week-old relationship?

"Good for them," the Bromance star recently told Usmagazine.com. "I hope they’re very happy."

Trust us, Brody -- judging by those goofy PDA pics we posted yesterday, they couldn't be happier if they tried.

* and was rumored to have taken up with Heidi's sister, Holly.

'Tis the season to be jolly! And what better way to spread the holiday cheer than by going public with your moviestar girlfriend?

Spotted: The Hills' Doug Reinhardt (a.k.a. Lauren Conrad's ex-fling and the guy who once called Steph Pratt a "lost puppy") cozying up to his new squeeze, Amanda Bynes, at not one but TWO different Lakers games this past week.

Above, check out the crazy hot knee-rubbing action (Get a room, you two!), the romantic textathon (ur the best! no u r!) and the out-of-control (Whitney and Jay-inspired??) hand-holding sesh/third quarter makeout.

Hey, way to go, Dougie! Guess that's one way of showing everyone you've got "game."