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Taylor Swift and John Mayer showed up at the same place Wednesday night ... eating dinner within eyeshot of each other ... and we know what didn't happen.

We got pics of Swift and Mayer leaving Chateau Marmont in West Hollywood in separate cars ... so there's smoke.

But there's no fire. Our Chateau spies say John and Taylor saw each other but didn't exchange a single word.

They famously dated a few years ago and traded breakup songs about their relationship.

Robin Williams' son Cody put on a brave face ... mingling with friends Tuesday in San Francisco to celebrate his dad's life.

Cody was dressed casually as he arrived at an invitation-only event at Marsha Garces' home ... she's Cody's mom and Robin's second wife. The outside of the house was strewn with candles and bouquets from well-wishers.

The 22-year-old Cody is not seen in the pic with his sister, Zelda, or half-brother, Zac.

Henry Cavill has gone into the phone booth again ... and come out as Superman!

The "Man of Steel" star was in downtown Detroit Wednesday in full regalia on the set of "Batman vs. Superman: Dawn of Justice."

As cool as the Superman getup is ... that robe is kinda dope too, right?

Robin Thicke is living that bachelor life now, which includes making a solo run to the grocery store Tuesday.

Robin went to the uber-expensive Bristol Farms in Bev Hills ... where 3 bags of groceries can really set you back. And, just like the rest of us, he succumbed to the temptation of tortilla chips.

Jennifer Lopez and Casper Smart were back together Monday ... and when she spotted the photog she ducked for cover -- which totally means they're banging!

We think it's JLo's car ... it's definitely not his, although he's driving.

JLo and Casper broke up in June after dating 2 1/2 years. There were reports Smart cheated on JLo with a transsexual, but he denied it and threatened to sue.

As we reported ... the breakup was amicable and they parted as friends. Now it appears there may be benefits to the friendship.

Audrina Patridge is on the market again after 5 years with BMX biker Corey Bohan ... but retired NFL stars apparently aren't part of her rebound plan.

Audrina was at LAX giving us some relationship advice when a recently minted NFL Hall of Famer just happened to stroll by ... which got our cameraman thinking he'd be the perfect rebound guy.

We'll let you see how the encounter played out ... but suffice to say she's still available

Poor Sapp ... look what he's missing out on.

Kylie Jenner is full of BS by claiming she was rear-ended by a reckless driver Thursday ... because the other driver says she not only caused the crash but copped an attitude.

As we first reported ... the 17-year-old was driving her brand new Range Rover when -- according to her -- a woman swerved into her lane and rear-ended her.

But the woman's lawyer says what REALLY happened is that Kylie made an illegal U-ey with no warning and crashed into oncoming traffic.

The accident was so bad ... the lawyer -- Gary Daglian -- says his client's passenger ended up in the hospital.

Antonio Banderas is single and ready to mingle ... and he zeroed in on an attractive woman while partying in St. Tropez over the weekend.

If Nicole Murphy were in the NBA she'd lead the league in rebounds.

Murphy and some young mystery man hit up Moonshadows in Malibu for lunch Saturday just days after reuniting with Michael Strahan for lunch Thursday in Beverly Hills.

And of course ... there's very handsome former NBA star Jim Jackson whom she was banging in Puerto Rico.

As we previously reported ... sources close to Strahan and Murphy told us there's a possibility for reconciliation -- so it's feasible this date was just a friendly meal.

These girls ain't loyal ... or are they?

Chris Brown and Karrueche Tran prove ... there really is a fine line between love and hate ... because it seems they're back together.

They two got super handsy Saturday at a charity football game in L.A.

Just days ago Karrueche had nothing but bad things to say about Chris -- and sources close to Brown painted an equally unflattering pic of the relationship.

We also got the former couple leaving the game ... and once again, Chris was openly affectionate.

Michael and Nicole, Justin and Selena, Chris and Karrueche ... maybe this is the secret to a long relationship.

Katharine McPhee can't keep her hands off her co-workers ... but it's not a director this time ... it's her new show's leading man.

McPhee was on set Thursday getting handsy with Elyes Gabel, her co-star in the upcoming CBS series, "Scorpion." Unlike her last on-set romance ... Gabel's not married and she's getting divorced.

You'll remember ... photos surfaced of McPhee locking lips with "Smash" director Michael Morris in October 2013. McPhee was married to Nick Cokas (though she claims they were separated) and Morris was married to actress Mary McCormack (they're still together).

Her next project will be interesting ... what the hell will she do if she co-stars with Neil Patrick Harris?

With most of Hollywood already come and gone from the IT destination spot of the summer, Oprah Winfrey and Gayle King rolled into Ibiza Thursday for a little fun in the sun.

The positive? No crowds. The negative? No crowds. Seriously, these two have to be running out of stories to tell each other.

These are the last known pictures of Robin Williams ... a day or so before he committed suicide.

A frail Williams was at an art gallery reception Saturday night ... near his Bay Area home. He surprised local artist Mark Jaeger -- a ceramics teacher at Marin Catholic High School -- whose works were featured.

Jaeger tells TMZ Robin was there for about an hour, seemed in good spirits ... laughing frequently. Jaeger says Williams was not drinking.

Jaeger's art includes a "superhero sculpture series" ... Robin purchased one of his superhero clay heads in the past. The artist says he and Williams were talking about a possible script based on the concept of his sculptures ... a homeless superhero who comes out during the night to help people in need.

Robin was there with wife Susan Schneider ... the woman in the foreground with dark hair. We're told Robin spoke to Jaeger's students and seemed engaged.

The pic was taken at 5:45 PM Saturday. Robin's body was discovered Monday morning.

Yes, that's Madonna's daughter Lourdes ... and yes, that's her takin' a drag off something that doesn't seem very tobacco-ish.

The bikini-clad 17-year-old is vacationing in the South of France this week -- sans parents, at least as far as we can see -- and partaking in a little puff puff with friends in between jumps in the Mediterranean.

They must be having a pretty good time, cause that cig's getting smaller and smaller.

Ramona Singer -- who stars in "Real Housewives of New York City" -- has gone to the NYPD ... claiming her estranged husband's mistress has been stalking her ... TMZ has learned.

Law enforcement sources tell us ... Ramona called 911 Wednesday afternoon, claiming the woman had followed her to a restaurant.

Ramona revealed last week she was leaving hubby Mario Singer, although she didn't say why. Other members of the cast dimed Mario to the media ... at least they alleged he was cheating.

But now we know ... Singer herself believes Mario was cheating, and for some reason she believes the mistress is obsessed with her.