Sofia Vergara Looks Like an ENGAGEMENT RING!

"Modern Family" hot mama Sofia Vergara celebrated her big 40th birthday on Tuesday by rocking a sexy bikini in Mexico ... and flashing what is reportedly her new giant engagement ring.

Sofia's on-again-off-again businessman boyfriend Nick Loeb reportedly popped the question this week and gave her the huge bling during their vacation with pals on the Riviera Maya.

Sofia -- who dated Tom Cruise back in 2005, before the whole Katie Holmes thing -- has a son from a previous marriage.

Jessica Alba Belly Nice Bikini

Jessica Alba let all her bronzed gorgeousness hang out in a sexy two-piece bikini while soaking up the sun in Italy on Tuesday.

Just like Scarlett Johansson, the 31-year-old mother of two can definitely stomach the European heat.

Scarlett Johansson Bikini Superhero

It's no secret what Scarlett Johansson's super powers are ... looking ridiculously hot in a sexy wet bikini.

The 27-year-old showed off her Black Widow curves while on a yacht in Italy with a super buff man friend on Monday.

Here's rock solid proof why Scarlett is worth every penny of the $20 million she's reportedly banking for the "Avengers" sequel.

Kate Hudson One Hot Bikini Mama

Kate Hudson took a holiday from making all those awful romcoms to bask her mother-of-two curves in a sexy black bikini in Greece on Thursday.

Despite "Alex and Emma," "Raising Helen," "You, Me and Dupree," "Fool's Gold," "My Best Friend's Girl," "A Little Bit of Heaven" and "Something Borrowed," the fit 33-year-old has a great body of work.

Hayden P's Bikini In a Tight Spot

And now ... some photos of Hayden Panettiere in a really small, wedge-tastic bikini ... because it's summer.

Hayden hit the beach in Cabo San Lucas, Mexico this week ... showing off her tiny physique as she tanned by the pool.

Hayden's NFL player BF Scotty McKnight was there too ... no shirt, no problem.

Seal REBOUNDING With Bikini Babe

Seal's officially done mourning the death of his marriage to Heidi Klum ... 'cause the singer has moved on to a smokin' hot brunette who looks damn good in a bikini ... and TMZ has the pics.

Just 3 months after Heidi filed for divorce, an extra-sweaty Seal was spotted on a yacht in Italy this week ... gettin' all kissy kissy with a mystery babe after a quick workout session on the deck.

There was cuddling ... there was smiling ... but there was no sign of Seal's wedding ring.

TMZ broke the story, Heidi decided to break off the marriage because she got sick of Seal's explosive temper. The couple later released a joint statement saying they had simply "grown apart."

Meanwhile, Heidi ain't lookin' so bad either ... and made sure the world knew it on July 4th ... when she tweeted out this photo of her insane supermodel physique.

Damn.

Sean Kingston LET'S-A-GO!!! Get a Mario Kart Tattoo

Mama mia! Sean Kingston loves Mario Kart so much ... the singer tattooed a giant freaking memorial to the video game on his arm ... and the pics are kind of awesome.

King posted the photos on Twitter the other day -- showing his new suped-up Mario Kart inkjob in progress inside his L.A. home ... courtesy of a local tattoo artist named Peter Koskela.

We're told the tat cost Sean a total of $1,250, and took 5 uncomfortable hours to complete.

File it under things Sean will probably regret in 20 years.

Aw-wawawawawawawa.

Leonardo DiCaprio New Summer New Supermodel

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In honor of Leonardo DiCaprio's latest supermodel conquest, Erin Heatherton -- and her bikini -- we're saluting all of his perfect 10 beachmates ... and there have been MANY!

Check out TMZ on TV -- click here to see your local listings!

Aubrey O'Day Miami Badass

Former Danity Kane Aubrey O'Day bottomed out in Miami and showed off her big round orange booty in an interesting thong bikini type thing on Wednesday.

She ridonkadonkulous!

Candice Swanepoel Itty Bitty Teeny Weeny Supermodel Bikini

Victoria's Secret supermodel Candice Swanepoel is used to walking around in her underwear ... and basically did that by wearing a ridiculously sexy mismatched tiny two piece swimsuit in Miami Beach on Wednesday.

The leggy 23-year-old South African babe is definitely doing her part to contribute to the scorching heatwave.

Leo DiCaprio Don't Worry, I'm Still Bangin' Supermodels

Ladies and gentlemen, it's that time of year ... when Leonardo DiCaprio trots out his super-hot bikini-clad supermodel girlfriend and reminds you that it does not suck to be him.

This time, Leo was out in Hawaii with his 23-year-old Victoria's Secret model plaything Erin Heatherton (33-24½-34).

Leo's pal Tobey Maguire was also hanging out on the beach.

Just to remind you -- before Erin, Leo was romantically linked to Gisele, Bar Refaeli, model Kristen Zang, model Emma Miller, Blake Lively and probably more hot chicks we've never even heard about.

Cristiano Ronaldo My Super Hot Girlfriend Makes Me Sleepy

While bronzing his already golden muscled skin on a yacht in St. Tropez on Monday, soccer stud Cristiano Ronaldo had more important things to do than pay attention to his ridiculously hot bikini clad girlfriend Irina Shayk ... like take a nap.

Ronaldo is livin' the dream.

Candice & Arianny AWESOME Attack of the Beach Bums!!

Victoria's Secret model Candice Swanepoel and UFC ring girl Arianny Celeste have two things in common -- and you're about to see a lot of both. Happy 4th, America!

Check out TMZ on TV -- click here to see your local listings!

Jessica Simpson I Have Not Reached My Goal Weight Yet

Nine weeks after giving birth to daughter Maxwell, Jessica Simpson once again showed off her voluptuous post-partum curves and nearly spilled out of her slimming black spandex fitness wear as she made her way to a gym in L.A. on Monday.

31-year-old Simpson -- who inked a $4 million deal with Weight Watchers -- has vowed to slim all the way down to 130 pounds.

Jess does not want to be an unfit mom.

Formula One Honcho Driven Two Pieces

62-year-old super rich former Formula One manager Flavio Briatore -- who is the biological father of Heidi Klum's eldest daughter -- enjoyed the sight of his 32-year-old bikini-clad model wife Elisabetta Gregoraci in Sardinia, Italy the other day.

Who says money can't buy you happiness?