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While her cheating husband has been seen still wearing his wedding ring after being caught having an affair with his "Snow White and the Huntsman" actress Kristen Stewart, director Rupert Sanders' wife Liberty Ross surfaced without her wedding ring in L.A. on Monday.

Gwen Stefani is a 42-year-old mother of two -- but that didn't stop her from looking 20 years younger on the beach in Miami this weekend ... in a sexy tiger print bikini.

Don't speak. We know just what you're thinking.

Stop us if you've heard this one before ... Paris Hilton's hookin' up with a new guy ... and it was all caught on film.

Paris and her new flavor of the month got pretty hands on with each other during a trip to the beach this weekend in France ... rubbing on each other ... and splashing around in the ocean.

Sources tell us ... the mystery man is a "successful businessman from Europe" ... and he and Paris have been friends for years.

Nothing says party time like a pair of boobs in your face -- which is exactly how 11-time Olympic medalist Ryan Lochte celebrated in London last night.

According to sources, Lochte -- along with American teammates Nathan Adrian, Cullen Jones, and Matt Grevers -- hit up Chinawhite nightclub in the Big Smoke around 11PM ... and left around 3:30AM.

We're told they drank gold bottles of champagne all night -- obviously -- and even ordered some Patron and Grey Goose for good measure.

But they didn't leave empty-handed -- they piled into a cab with several, very excited females ... one of whom sat on Lochte's lap, placing her fun bags a mere nuzzling distance away from his face.

Meanwhile, Michael Phelps was partying a few miles away -- with his medals.

As if the past couple of weeks haven't been enough of a rollercoaster ride, Michael Jackson's kids hit up Six Flags Magic Mountain this weekend with one of their newly appointed co-guardians.

No, it wasn't 82-year-old Katherine Jackson. This time, TJ got the nod.

Paris, Blanket and a sleeveless Prince spent their Saturday with the fun co-guardian -- hittin' up all the crazy rides at the theme park ... including "Revolution" ... the first rollercoaster ever built with a loop.

Michael Phelps took three of his closest friends out clubbing in London this weekend -- gold medal, gold medal and gold medal.

Just hours after swimming the last race of his career, Phelps -- the greatest Olympian in the history of the Olympics -- hit the party scene in Soho ... along with 3 of his 18 gold medals ... and a mystery blonde.

Phelps and his medals partied responsibly ... after they partied themselves out, they all piled into the backseat of a waiting SUV and got a ride home.

Jack Nicholson is THE MAN ... so it's no wonder none of his friends could muster up the courage to tell him his fly was down as he walked out of Mr. Chow on Thursday night.

Italian model and babe professionale Claudia Romani really explored her animal instincts yesterday in Miami -- flaunting her Mediterranean assets on the beach ... in a smoking hot leopard print bikini.

Now that's one spicy meat-a-ball!

The "Real Housewives of Beverly Hills" doc was spotted smiling and laughing with his three boys and a nanny on their way into Benihana last night.

A source close to the family tells TMZ that reports of a brewing custody battle with Adrienne are false -- and in fact, Paul only wants "what's best for his children." We're told Paul wants joint custody, and doesn't anticipate that being an issue.

As for Paul and Adrienne's considerable fortunes -- our source confirms there is a prenup that would protect them if they divorce.

We're also told that Paul does NOT want details of their breakup to become a plot line on 'Housewives' ... because he doesn't believe it will be portrayed fairly or accurately.

Sources close to Paul tell us ... "Dr. Nassif’s sole focus is making sure both Adrienne and the kids are as happy as possible in this very difficult time. His goal is to ensure the best interest of the children. He is going to stay focused on them and his patients."

"Vampire Diaries" resident good witch Kat Graham cast a spell on the beach in a chic yellow high waisted bikini while with her buff shirtless boyfriend Cottrell Guidry in L.A. on Tuesday.

Tired of roaming the halls of the former Spelling mansion, Petra Ecclestone left her $85 million home to take her brand new ridiculous pink Rolls Royce out for a spin in Beverly Hills this weekend.

While out on the town in her Barbiemobile, the 23-year-old heiress hit up a nail salon where an army of staffers tended to her hands, neck and feet.

Maintaining a "privileged" lifestyle requires a lot of grueling work.

Rupert Sanders -- the philandering director who cheated on his wife with Kristen Stewart -- wants the world to know he's still married (at least for now) ... 'cause he's proudly sporting his wedding ring.

Sanders finally emerged in L.A. just a few hours ago -- it's the first time we've seen him in public since those crazy scandalous photos emerged showing the "Snow White and the Huntsman" director -- and father of 2 -- making out with his lead actress ... who was also in a committed relationship with Robert Pattinson at the time.

Sanders released a statement a few days ago ... begging his wife to not dump his adulterous ass. It's unclear if she's made a decision yet.

After months of disappearing, re-appearing, and checking in and out and back in again from rehab ... formerly missing "Terminator 3" star Nick Stahl was spotted in West Hollywood today.

As TMZ first reported, Stahl's wife reported the actor missing back in May, gave up looking for him in June, reunited with the family earlier this month and and is now seeking treatment for substance abuse.

Robert Pattinson isn't wasting any time -- a UHaul was spotted outside the Los Feliz home he shares (shared?) with Kristen Stewart ... following reports he's moved out of the love nest he lives (lived?) in with his (ex?) girlfriend.

Kristen's baffling public apology after her alleged affair with married director Rupert Sanders set this chain of events in motion.

Muhammad Ali ... the GREATEST of All Time ... has arrived in London for the 2012 Summer Games ... 52 years after winning his own gold medal.

Ali was spotted leaving his hotel Tuesday with some help from his wife Lonnie (left).

There are rumors Ali will have a role in the opening ceremonies on Friday ... but so far, no one has confirmed one way or the other.

While snapping pics on the beach, Melanie Griffith flashed her soft porcelain lady curves in a tasteful black bikini in Hawaii on Tuesday.