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Paris ain't called the City of Love for nothing -- Rihanna and Drake are both in town ... and they can't stay away from each other.

Drake is in Paris for a concert -- he performed last night -- but he and Rihanna have been hanging out since the weekend ... grabbing a fancy dinner at Paris's famous L'Avenue restaurant Sunday.

Rihanna re-connected with Drake at his concert the next day ... slipping in the rear entrance.

After last night's concert, the on-again off-again couple hit up a nightclub ... and from there, we're told they both crashed at the Hyatt hotel, where Drizzy has a room.

Guess that means they're on again.

Simon Cowell's two dogs are puppies non grata on the beach in Miami -- the TV mogul was just warned by cops to get them off the sand ... or else.

Simon's been chilling in the sun all day with GF Lauren Silverman and their newborn son Eric -- but despite the beach's explicit NO DOGS ALLOWED rule, he brought along his two Yorkshire Terriers Squiddly and Diddly.

We're told a police officer gave Simon an official warning ... and Simon and Lauren took off soon after.

We almost felt bad for the dogs ... almost.

Chris Brown finally threw something that didn't get him in trouble ... his cap, because he's graduated from an exclusive anger management rehab school in Malibu ... and he's back to making music.

Brown was at Universal City Walk shooting a music video over the weekend.

Chris has completed his 90 days of live-in rehab, after the judge in the Rihanna beating case ordered him to attend ... or else.

You'll recall ... Chris entered a rehab facility on his own, shortly after getting arrested for assaulting a dude in D.C., but he was booted out after going into a rage and throwing a rock through his mom's car window.

Climb every mountain, Chris.

You can see the pleasure in Mel Gibson's face as he left a restaurant in Malibu Friday. He didn't want to talk about Oksana Grigorieva and the fact that she has gone belly up ... filing for bankruptcy. But you can see a certain peacefulness and calm that hasn't been exactly front and center.

As we previously reported ... Oksana could have been set for life if she didn't reject Mel's $15 million settlement back in the day, when those tapes were just between them. But she got greedy, and ended up with $750K and lots of lawyers bills. And half of that money was taken away because she blabbed about Mel ... violating their confidentiality agreement.

Fact is ... Oksana is still riding Mel's gravy train. He's paying $20K a month for child support, and that will likely last until Lucia turns 18.

But Mel clearly had a good day in the Bu.

Simon Cowell was sent packing Friday ... just days after his baby was born, but not because Lauren Silverman threw him out -- because a judge laid down the law in her complicated custody case.

As we previously reported ... Lauren's nasty divorce from Andrew Silverman ended with a custody arrangement for their 7-year-old son Adam, which required Lauren to keep Simon away from the kid for a year. Adam stayed with Lauren over the last few days, which meant Simon needed to skedaddle.

Simon moved into the swanky St. Regis Hotel in NYC ... but we're told he moved back with Lauren when Adam left.

As for the immediate future ... we're told Simon will stay in NYC for 4 to 5 weeks, until their baby is allowed to fly. The new family will then go to London for "X Factor" auditions. They'll be in the UK for around 3 weeks and then return to NYC.

Our Simon sources say he and Lauren will split their time between NYC and London, and since he has a plane it's no big deal.

Miley Cyrus showed her mama what she got from her -- and her daddy too -- at a very intimate concert Thursday night in Anaheim.

Billy Ray and Tish Cyrus seemed ... interested in their daughter's gyrations and self-gratification as they looked on.

There's a lot for them to be proud of ... Miley is rich, successful and famous at the ripe age of 21. And she has a great ass and a vaginal obsession.

Congrats Billy Ray and Tish. Good work.

The Odom has landed.

Lamar Odom's Spanish basketball career is officially underway ... with L.O. arriving in Vitoria-Gastiez, Spain on Wednesday to join his new team -- and the media was ALL OVER THE GUY.

Odom signed a 2-month contract to play for the crappy Laboral Kutxa basketball team -- a team that's last in its division -- and many skeptics say they only signed Odom as a shameless P.R. move.

Just look at the photo ... dude's been swarmed by the media since he stepped off the plane.

Still, Odom sees the whole thing as an opportunity to prove he can still play -- and believes it could lead to a triumphant return to the NBA.

He's expected to hit the hardwood as early as Saturday. Stay tuned ...

Lamar Odom doesn't just think he can save his basketball career in Spain ... he also thinks he can save his marriage ... and to prove it, he rocked his wedding ring on his way out of the country.

Odom was all smiles as he rolled through LAX on Tuesday ... right before he boarded his plane to Espana, where he'll join a Spanish pro basketball team (Laboral Kutxa Vitoria).

But it was clear he wanted to make a statement about the state of his marriage to Khloe Kardashian -- by wearing the ring on his finger.

As we previously reported, Khloe already filed for divorce ... and wants out of the marriage.

Clearly, Odom is an optimist these days.

Jessica Simpson's dad is sticking tight to a 6'2" stud -- parading him all over Miami Beach -- and TMZ has learned it's all to make a buck.

The eye candy Joe Simpson photographed sprawling in the sand last weekend has a name ... it's Jonathan Keith, and he's a model Joe is taking under his wing.

A source connected to Joe tells us JK is fresh off the boat from Scotland, and Joe's been managing him for about 5 months.

We're told Joe and Jon are in Miami to book modeling gigs. So that whole scene on South Beach was just practice.

Nice pull, Joe.

No one had a better ride than Michelle Rodriguez last night -- just ask her pants ... which disappeared off her body while she was in the backseat of a limo with her new GF Cara Delevingne!

Here's what we know.

Fact: Michelle was wearing white pants when she and Cara hopped a ride back to their London hotel.

Fact: Michelle stepped out of the car cloaked in her bodyguard's jacket ... WITHOUT pants.

FUN FACT: CD stepped out of the car right after Michelle ... holding white pants.

Fact: These pictures tell an AWESOME story, and this is our new favorite celeb couple.

Jessica Simpson's dad Joe has found a young man to spend his time with ... and photograph ... shirtless ... in Miami.

The pics were taken Saturday in South Beach, showing 55-year-old Joe getting his tan on with a much younger man ... and then taking shirtless photos of the guy, sprawled out on the sand.

Joe divorced ex-wife Tina in April after 35 years of marriage.

Whatever ... looks like he's having fun.

Michelle Rodriguez and supermodel Cara Delevingne are acknowledging the obvious -- they're the hottest lesbian couple in the universe -- and to prove it they ate out last night.

Michelle and Cara were photographed leaving a London restaurant together, looking very coupley.

And to make it official -- before their date, Michelle told The Mirror they're an item, saying, "It's going really well. She's so cool. When we started hanging out, I just thought she was awesome, and we have the best time together."

35-year-old Michelle and 21-year-old Cara have been all over each other for 6 weeks now -- starting last month with a drunken makeout session courtside at a Knicks game -- so nothing fishy about this hookup.

Anti-fur activist Khloe Kardashian made her views explicit in NYC Monday morning -- rocking a fake fur coat on the street ... with the words "FXCK YO FUR" spray-painted on her back in bright red letters.

Khloe has spoken out against wearing fur for years -- and even partnered with PETA on several campaigns, but she cut ties with the organization in 2012 after a PETA-affiliated activist dumped flour on Kim K during a red carpet event.

If you love little people, over-sexualized 21-year-olds AND marijuana -- Miley Cyrus has your back ... 'cause she is dealing pot paraphernalia on her tour.

At Miley's Vancouver stop of the Bangerz tour this weekend ... she was hawking rolling papers -- 2 free 24k gold leafed sheets -- with the purchase of her tour book (filled with sexy Miley pics).

Let's face it ... probably not a bad idea to smoke a fatty -- just to get through watching Miley perform faux fellatio on a dude in a Bill Clinton mask.

Just sayin' ...

Julianne caught some So. Cal. rays with Washington Capitals center Brooks Laich. With photogs in plain sight they clearly wanted to make a statement as they walked with her teeny tiny dogs.

It's not like Ryan Seacrest will be heartbroken. He's moved on with another hot chick, who apparently is cool that he sees other people as well. In other words, don't feel sorry for him.

Kanye West took his favorite mouth to dinner yesterday ... one day after he praised Kim Kardashian's oral skills on a new remix.

The two went out for a romantic evening in New York after his concert in New Jersey -- probably to make up for his recent remix of "Drunk in Love" ... where Kanye said he first fell in love with Kim after "impregnating her mouth."

Mercy.