Katharine McPhee My Hawaii Trip Is Bumpin'

Katharine McPhee's idle time looks just as good as her 'Idol' time -- in fact it looks hotter, due to her butt-hugging swimwear in Hawaii.

Kat's on vacation and Thursday she was ready to swing into the weekend ... courtesy of some chill time in a hammock. Her bf, David Foster, wasn't around, but she seemed to be in a deep FaceTime convo with someone. Based on the Blue Steel looks she was flashing ... it could've been David.

Looks like Katherine knows how to work her angles. All of them.

Justin Bieber Sweet Vacay with His 'Proud' Mama

Justin Bieber's not only reconciled with his mother ... he's carved out some quality time with her in the tropical paradise of the Maldives.

The Biebs and his mom, Pattie Mallette, are vacationing together, which is a big deal. They've been estranged for years, and only recently started reuniting. Based on Pattie's own words ... it's going very well.

She posted this pic and gushed ... "I'm so proud of the amazing young man you are, and the young man you are becoming. None of us are perfect and never will be, (so we will always need patience and grace for each other), but your genuine growing relationship with Jesus is evident in the choices you are making daily and the good 'fruit' you bear. I admire your character and integrity."

Since canceling his Purpose Tour, in part to focus on his religion, Justin's reconciled with Selena Gomez ... and now his mom.

There's a definite pattern.

Dennis Quaid Let 'er Ripped!!! Hot Beach Date with GF

Dennis Quaid's not letting age slow him down ... instead, he's hitting a Hawaiian beach with his much younger gf, packing on the PDA, and showing off his ripped 63-year-old bod.

Dennis and model Santa Auzina had nothing but a good time Wednesday on the sand in Kauai -- hugging, kissing in the sand, and hanging with friends.

After a quick makeout sesh ... the couple hit the water for something called SUPsquatching -- which is basically paddleboarding, but with a group of people together on a huge board.

These two love to live life on the edge.

Sean Kingston Jet Skiing Again After Near-Fatal Accident

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LESSON NOT LEARNED

Sean Kingston is back at the scene of the jet skiing accident that nearly took his life, and yes ... he's jet skiing again.

Sean was cruising around waterways off Miami Sunday with a few other friends ... all on their own personal watercrafts. He was recording video as he zipped around, which makes you wonder how much he's learned about safety.

You'll recall ... Sean slammed his personal watercraft into a bridge off Miami Beach in 2011. He was critically injured in the accident, and cited for "careless operation."

Sean and his "jet ski mob" tried to get DJ Khaled to come out and play, but no dice. Maybe he's heard about Sean's track record.

Ex-WWE Star Summer Rae Bikini Makeout Sesh ... W/ NHL Star

Summer Rae's got serious game -- 'cause the smokin' hot former WWE superstar was suckin' face in Cabo San Lucas with Dallas Stars stud Tyler Seguin!

No word if they're dating or just having fun -- but they're both in insane shape and look damn good in their bathing suits.

But get this ... Tyler was just named a 2018 NHL All-Star (his 5th All Star nod) -- so maybe they're celebrating?!

By the way, he's 25 and she's 34 -- GET IT SUMMER!!!

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BUNS IN THE SUN

Jaden Smith Takes an Ugly Stand ... Practice Makes Perfect!!!

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GNARLY, DUDE!
MEGA

Jaden Smith on a surfboard was like a newborn giraffe taking its first steps... wobbly as hell but gets the job done.

Jaden's out in Hawaii on vacation with little sis Willow ... and both suited up to hit the waves. Jaden's no stranger to the adrenaline rush. Who else is down to jump out of a plane at 15?

He's shaky at first on the board but no doubt he'll master the art of surfing. And check out Willow ... posing like a strong contender to land the cover of Surfer magazine.

Jesse Williams I'll Stick to Acting ... These Brazilian Kids Know Soccer!!!

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SHOWIN' HIM HOW IT'S DONE
BACKGRID

Jesse Williams is better at playing doctor than he is at soccer, because he could barely keep up in a pickup game with a bunch of Brazilian kids half his size.

The "Grey's Anatomy" star is down in Rio and Thursday he decided to hit up a favela to try his feet at the beautiful game. It was awesome ... for the locals. You gotta see the moves the little guys dropped on Jesse ... putting the ball between his legs at least twice. Nutmeg!

He eventually had to go shirtless as he worked up a sweat ... so, there's something for Jesse's fans!

No shame in losing to these kids, though. For all we know, he was playing the next Neymar.

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Britney Spears So Long, Vegas ... Yellow Hawaii!!!

Britney Spears is taking a load off in Hawaii after ending her residency in Las Vegas -- and we are so thankful for the break ... and the view.

Brit was spotted rockin' a yellow bikini on a Hawaiian beach Wednesday -- just a few days after she performed her last residency show in Vegas for New Year's Eve.

She went out with a bang then, and it looks like she's still banging now. Britney's toned figure was on full display ... and, Lordy, does she look good.

Gotta say, we can get used to bikini Britney in a heartbeat. Aloha!

UFC's Anthony Pettis Off-Roadin' in Aruba ... w/ Hot New Fiancee!!

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LAVISH LIFE

The holidays are over for us normies, but not for UFC star Anthony Pettis and his smokin' hot fiancee ... who are out in sunny Aruba getting their safari on!

It ain’t just any average trip -- Anthony popped the question on NYE at the Aruba Ritz-Carlton ... and Lisette said yes!!

Since then, the future Mr. and Mrs. “Showtime” have been living it up on the island -- exploring ancient ruins, off-roading at a safari and hitting the beach with flamingos are just a few of the activities they've been getting into.

Not like Anthony really cares -- anything with Lisette is winning.

Congrats!!

Paris Hilton I Only Have Eyes For My Ice!!!

Paris Hilton can't take her eyes off her new BFF ... and we're not talking about her fiance Chris Zylka.

Paris had a laser lock on the giant 20-carat, $2 million engagement ring Tuesday as the couple took a romantic stroll around Aspen.

Not on accident -- of this we're sure -- Paris was wearing fingerless gloves, but no glove could hope to contain that gem.

As we reported, Zylka popped the question mid-mountain over New Year's weekend -- and he's probably been competing with the rock for Paris' attention ever since.

They really are a girl's best friend. A really big best friend.

Mark Wahlberg These Abs Are Made for Diving ... Successfully?

Mark Wahlberg's swole body should be motivation to hit the gym -- at least until you quit your New Year's resolution in 3 weeks -- but his diving form might need some work.

Mark's been vacationing in Barbados with his wife and 4 kids and having a blast ... as you can see in these pics of the action star attempting a dive off a doc into the Caribbean.

Take off was strong, but midway Mark looks like he's heading for an awesomely painful belly flop.

Check out the gallery to see if he pulled it off in the end.

Candice Swanepoel Check Out My New Curve!

Candice Swanepoel is used to showing off her curves in a bikini, but it was a different one catching people's eyes on Monday in Brazil ... her growing baby bump!

The Victoria's Secret Angel took a stroll in Trancoso, Brazil proudly showing off her new bun in the oven. Her partner, Hermann Nicoli, is Brazilian, which explains why the South African model was down there.

She already has a 1-year-old son, Anaca, with Nicoli. Unclear how far along she is. Candice announced she was preggo in December.

Justin Bieber In Cabo for NYE ... Ditto for Selena

Justin Bieber can't seem to stay away from his girlfriend, Selena Gomez, for the holidays ... 'cause they're in the same town south of the border for New Year's Eve.

Bieber was spotted shirtless and soaking up some sun Sunday in Cabo San Lucas. Seems like he's excited, and why shouldn't he be? Selena's in the same hood!

Selena was also seen in Cabo with some friends Saturday in a would-be girls only trip for the holiday weekend ... except now, it's clear that Bieber's probably just a beach run away. Our bet is they're smooching when the clock strikes 12.

Should old acquaintance be forgot ... meet 'em up in Mexico to jog your memory.

Michelle Obama Yoga With Malia In The Aloha State

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THE GURU'S IN THE HOUSE
TMZ.com

Michelle Obama and daughter Malia got some extra R&R during their Hawaiian vacation by hitting up a local yoga studio.

The former First Lady Wednesday was spotted at Corepower Yoga in Kailua, Hawaii where the Obamas have been vacationing for the holidays. Michelle looks incredibly fit -- as usual -- and visibly happy. That million dollar smile says it all.

Although Malia joined her mom... there was no sign of Barack or Sasha. As for the family as a whole, splitting your time between yoga classes and the beach doesn't seem all that bad.

Namaste!

Teresa Giudice No Joe, No Problem Cancun Trip with My Girls!!!

Teresa Giudice and her daughters aren't letting the holidays apart from Joe Giudice get them down ... instead soaking up some sun in Cancun.

The New Jersey 'Housewife' is currently vacationing with her girls and her dad down in Mexico -- spending her time applying sunscreen, relaxing on a day bed -- and looking pretty fab in her black bikini.

We broke the story ... Teresa and her kids were unable to visit Joe in prison for Christmas because of some procedural issues, but plan to celebrate with him in the New Year.

Until then ... viva la Mexico!

Mark Wahlberg Beach Bod Alert in Barbados

Mark Wahlberg's looking absolutely shredded these days ... so there's clearly no reason for him to ever put a shirt back on, right?

The 46-year-old actor was spotted with his model wife Rhea Durham Thursday on a beach in Barbados ... showing off all of his muscles and his washboard abs.

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ROCK THE BUS
TMZ.com

It's funny -- just a day earlier, Wahlberg popped in on one of our TMZ Tour buses and sent the group into a frenzy ... but just imagine the reaction if he was shirtless then too.