Hook Ups

Lindsay Lohan is out in Greece showing off a new ring ... and it doesn't look a thing like the engagement rock she got from ex-fiance Egor Tarabasov.

Bikini-clad Lindsay was in Mykonos this week with a yellow gem on her left ring finger. She's reportedly been hanging in Greece with restaurant owner Dennis Papageorgiou ... fueling rumors she's moving on from Egor after their blowout fight.

Y'know what Egor's thinking -- where the hell's my emerald??!!

#HappyHunting

Khloe Kardashian has a brand new star athlete in her life ... Cleveland Cavaliers stud Tristan Thompson.

The two have been spending some serious quality time together recently ... and Thursday, they were spotted at a mansion in Beverly Hills ... flaunting their impressive physiques.

Unclear if they're friends ... or more ... but we did see them out at Bootsy Bellows nightclub together over the weekend ... and they left the club within minutes of each other.

One thing's clear ... they definitely look good together.

Justin Bieber used a date night with Sofia Richie to show off his serious skills on the drums.

Biebs was at Mozambique restaurant in Laguna Beach and joined a reggae band onstage recently, but not to sing ... he was there to beat the skins.

Sam Hunt and his on-again, off-again gf, Hannah Lee Fowler, are looking very ON while they show off their toned bods in Hawaii.

The sometimes exes got in some snorkeling Thursday on the Big Island, and didn't seem the slightest bit concerned about the hurricane headed their way.

Wilmer Valderrama and Minka Kelly seem to be rekindling an old flame, and it's already getting really hot.

The exes grabbed a spicy meal at Palms Thai Restaurant in Hollywood -- before leaving in Wilmer's ride. Note the perfect gentleman move with the car door.

Minka and Wilmer used to be an item in 2012 ... shortly after she split with Derek Jeter. Wilmer just broke up with Demi Lovato a couple months ago -- so this time he's the one rebounding.

And doing it well.

Cristiano Ronaldo's smokin' hot Miami makeout pal wants to share the love ... with a brand new workout video to help you get her world-class ass.

You remember Casi Davis ... the Florida-based fitness model who cuddled up and made out with CR7 poolside earlier this summer.

Well, Casi also happens to be a beast in the gym ... and has been puttin' in serious work to make sure her donk stays up to par for the biggest soccer star in the world.

Keep up the good work.

Rihanna and Drake moved their lovin' south to Miami and made it blatantly obvious nothing's under wraps anymore.

They spent Tuesday night getting very cozy at E11EVEN nightclub ... where RiRi rubbed his face in a way "friends" just don't touch each other.

Fact is they've been inseparable since Sunday night at the VMAs -- but friends close to them tell us they've really been a thing (again) since January when they shot her "Work" music video.

We're told all the guest appearances at each other's concerts this year haven't been just for show -- it was to spend as much time together as possible while touring.

The friends say they've seen this movie before, and even though it's not always a happy ending ... this is a longer stretch for them than usual.

Secret's out ... Demi Lovato is dating UFC superstar Luke Rockhold -- and TMZ Sports has learned it's a romance that's been blooming for a couple months.

Our sources tell us ... the 24-year-old singer hit it off with the 31-year-old former UFC middleweight champ earlier this year while training at Unbreakable gym in Los Angeles.

Long story short ... we're told the two clicked right away -- and have even sent some secret inside messages to each other on social media ... including a back and forth with smiley face art on their fingers.

Congrats!

Justin Bieber isn't dating a kid anymore -- his new girl, Sofia Richie, is now the BIG 1-8.

Justin and Sofia got their juice on Tuesday in North Hollywood, the day before she officially became a woman ... in age, anyway. They hadn't been seen together for about a week while Justin was overseas performing at a British music festival.

Now they're not only reunited -- they're legal! You can stop cringing.

Tinder's idea of letting users "Super Like" each other beyond a basic right swipe is genius -- but it's also not theirs ... so claims a guy who's now suing the company.

John Mellesmoen claims in a new lawsuit he pitched the idea of the "Super Like" to Tinder's CEO, Sean Rad, back in 2014, and says Rad loved it ... promising to compensate him if the company ever used it. John says he hasn't seen a dime.

Mellesmoen claims he laid out the entire concept of the "Super Like" feature, which essentially allows users to buy someone a virtual drink instead of the just giving a "glance across the room" with a regular right swipe.

Zayn Malik is still rocking Gigi Hadid's boat ... and paddling it too.

Zayn gave Gigi's arms a break while the couple went kayaking Thursday during their Tahitian getaway.

We haven't seen pics of them together in weeks, but nothing puts breakup rumors to rest like a romantic luxury South Pacific vacay.

Robert Griffin III and his wife have been separated for months -- after she found out he was dating a new woman ... and sources connected to the situation tell us she's absolutely devastated.

Avril Lavigne and Ryan Cabrera had the most romantic steak dinner you've ever seen 2 "friends" have.

The duo was spotted Tuesday night at STK Midtown in NYC, sipping rosé and chowing down on filet and foie gras. Witnesses say they were cozy, cuddly and even kissed a few times.

Avril's been adamant they're just pals. As we reported, Ryan moved in with Avril after she ended things with Chad Kroeger -- but only because his GF kicked him out. That's what friends are for, right?

Zac Efron stuck his landing in Rio, and immediately hooked up with Simone Biles ... moments after she nailed down her 4th gold medal.

The timing is no accident -- Simone crushed hard on Zac and the two exchanged some flirty tweets after The Final Five won gold in the team competition. Next thing ya know, BOOM ... Zac's flying south, and getting a smooch from Simone on the 'Today' set.

It's a good guess NBC paid for Zac's first class ticket to Rio.

Sure, it's just a kiss on the cheek, but at this point ... would you bet against Simone ending up with the gold?

Johnny Depp could have saved the paint -- and the blood --- when he allegedly wrote the words "Billy Bob" with what was left of his finger on a mirror ... because Mr. Thornton says he never hooked up with Amber Heard.

TMZ broke the story ... Amber and her people claim in March, 2015 Johnny accidentally cut his fingertip off in the middle of an argument with Amber ... and did his artful handiwork on the mirror after accusing her of cheating with Billy Bob when they co-starred in the flick, "London Fields," which was set to be released in 2015.

Billy Bob tells us the cheating allegation is ridiculous ... "completely false."

Thornton says he never socialized with Amber off set, other than a cast dinner. Even on the set, he says he didn't hang with her ... he was mostly around members of the crew. He adds he didn't even have a friendship with the actress ... it was all professional, on the set, and that was it.

As for Johnny, even though they were on the same set, Billy Bob says they had no interaction ... did not even speak.

Billy Bob's been married to wife Connie Angland since 2014. He says he's talked to Connie about the story and assured her it was Johnny's fantasy.

The Kardashians say The Game's lying when he boasted he slept with 3 of them on his track, "Sauce" ... he's wrong about at least 2.

Sources close to the Kardashians tell us you can count out Kylie, Kendall, Khloe, Kourtney and Kris ... none of them had sex with Game.

The sources acknowledge Kim dated Game back in the day ... so that one's on the table for discussion, but that's it.

Khloe and Game have been pals for years, but the Kardashian sources are adamant ... strictly platonic.

That said, there's an interesting nugget. Game reached out to Kanye to get his blessing for the song, and Kanye said he didn't have a dog in the fight. Interesting ... Game didn't call Kim.

But ... we know Game sticks by his story. He nailed 3 of them.