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Taiwanese-American actor Mason Lee was at the prime age of 21 years old when he was cast to play Teddy -- the studious little brother who gets lost and loses a finger while on a wild bender in Bangkok -- in the 2011 follow-up film "The Hangover Part II."

Joining Lee in the silly shenanigans included Zach Galifianakis as the childish adult who shows a growing sense of maturity since the prequel, Alan, Ed Helms as the dentist grappling with his hangover from the night of partying, Stu and Bradley Cooper as the studly leader of "The Wolfpack," Phil.

Stars love a good selfie, and these before-and-after photos are bound to stump you ... Put your celeb knowledge to the test and see if you can guess the incredible body transformation?!

This 38-year-old hairstylist is also a TV personality, commonly known from his (and his co-stars') Netflix series. You may have seen him flippin' around with Olympic gymnast Simone Biles for an Uber Eats commercial.

Turn up your Tuesday with this bikini babe, and guess which Hollywood hottie put her summer-ready bod on blast in these eye-popping selfies!

Kylie Jenner may need to step aside, because her bodacious bestie is bustin' through in her lil' bikini ...

Before this cute kid in her pink scrunchie was dancin' all around town and jammin' out onstage, she was just a competitive dancer -- starting at 6 years old -- and growing up in Lafayette, Louisiana.

Before she gained popularity on TikTok, she attended LSU, where she studied broadcast journalism. You probably most recognize her from her dancing to trending songs, but she's also friends with Hollywood's hottest stars like Kourtney Kardashian.

Need a couple more clues? Charli XCX brought this unknown star out during her Coachella performance. She likes sippin' on "Diet Pepsi."

Don't go chasing these waterfalls without a towel ... 'cuz we're about to super-soak you with these slippery celebs for International Waterfall Day!

Nailing the "Dirty Dancing" pose, Scheana Shay and hubby Brock Davies had the time of their lives in Bali, and Diplo dipped into the waterfall fun with a rock solid selfie ... what a rush!

Model Charly Jordan stripped down to her sports bra and hot pants to nail the perfect pic -- we're not complaining about the view 😉!

And, YouTuber Pierson Wodzynski snapped a silly selfie and took the plunge with her mouth wide open.

Kick off your week with this fun booty-guessin' game ... Can you score which Hollywood hottie put her summer bum on full display in this poolside pic?!

She's a singer from Milwaukee, Wisconsin. She loves her "Kings & Queens," and you probably have danced to her catchy bops out at the club.

American actor Shane West was in his early 20s when he was cast to play Landon -- the high school heartthrob who transforms from immature to compassionate -- in the 2002 rom-com classic "A Walk To Remember."

Sharing the big screen with West included Mandy Moore as the loyal, kind and religious high school gal with cancer, Jamie, Lauren German as Jamie's protective and supportive bestie, Belinda, and Peter Coyote as Jamie's strict father and prime minister, Reverend Sullivan.

Landon contributed to the "A Walk To Remember" soundtrack, and today he's a band member of the Twilight Creeps.

Happy Father's Day! Is there anything more badass than having a drummer for a dad?

Now, can you guess which dad is sipping on his coffee?

This drummer is best known for his distinct punk-rock style ... being married to a Kardashian ... and having a daughter who is an aspiring musical artist.

He may be sipping a coffee above -- but when he has drum sticks in his hands, he's selling out shows, performing at Coachella, and even playing piano. Y'know ... All The Small Things.

Can you feel that steamy heat?! It's the Day of the Dads, and they're blowin' smoke at you with their sexy poses, but can you pick up what we're puttin' down and name the unknown daddy?!

From singers to actors, models to athletes, the fathers of Hollywood are raisin' the temps this weekend, and the proof lies in the pics!

Put your celeb skills to the test and see if you can guess which fella is in each shredded shot!

These famous fathers are known to flash a sexy selfie or two ... hit up our gallery and identify who's who!

It’s Father’s Day, and Hollywood is showing love to dads everywhere — whether they’re raising the next generation of stars or are famous fathers themselves.

Celebrities took to social media to share touching tributes to their own dads and sweet snapshots with their children, flooding timelines with fatherly love and gratitude.

Oprah Winfrey kicked things off with a moving message about her father, writing, "My father is the root of all my successes -- personal, physical, financial -- because he understood intrinsically that fathering is a verb. It requires action, and acting according to the child you’re raising."

Thousands, including celebrities, took to the streets across the country over the weekend for "No Kings" protests, a growing movement aimed at challenging President Donald Trump's administration’s immigration policies.

In Los Angeles on Saturday, Jimmy Kimmel joined the rally with his parents, sharing a photo on Instagram and praising the "inspiring and peaceful" turnout. "I met many people who still believe this country can be a force for good. Most of all, I’m grateful for my parents, who taught me to care about others."

Kerry Washington also posted, captioning her photos with: "#NoKings, just some QUEENS… fighting for democracy."

It's Dad's weekend, and we're kickin' it off with the rich n' famous and their mini-mes. After all, imitation is the sincerest form of flattery, right?!

Posting their little ones with pride, Rob Lowe struck a shirtless pose with his son Johnny Lowe -- who's honestly givin' his old man a run for his money 💪, and Jeremy Bieber went golfing with Justin Bieber and shared a selfie in sunglasses.

And check out this cute pic of former basketball player and social media star Austin McBroom swaggin' out with his kid in their tuxedos.

One fatherly smoke show we gotta put on blast for this year's Father's Day: Idris Elba!!!

How are you not "OBSESSED" with his looks over the years?!

Here is a 31-year-old version of the handsome lad from London at the premiere of HBO's "The Wire" back in 2004 (left). Playing Stinger Bell thrusted him into the spotlight as one hot, hunky actor!

And, more than two decades later the hot daddy recently put his soft smiles and devishly handsome looks on display during the SXSW Music Festival in London (right).

Summer’s heating up, and celebs are bringing the fire -- flipping burgers, soaking sun, and grilling their way into full vacation mode!

Stars like Lil Nas X, Jake Miller, and Tyler Cameron are gettin’ down to business -- meat in hand, flames up, and cookin' up a summer feast like pros.

Demi Lovato turned up the heat and the romance -- snapping her man Jutes clutching a big ol' slab of meat like it was love at first sear.

When it comes to summer fruit, the stars have taste -- just ask Orlando Bloom 'cause he's all about the pineapple -- sweet, spiky, kinda like him ... while Nicole Scherzinger keeps it tropical with mango.

Sarah Silverman’s got range with watermelon and pomegranate -- and Henry Winkler? Controversially, he's not a strawberry guy -- he’s Team Fuji Apple. As for Bo Burnham ... he looked our guy dead in the eye and said his favorite fruit was him. Smoooooth!

From goin' deep on "The Pirates of The Caribbean" to hittin' the red carpet for the "Deep Cover" premiere, do you think you've got what it takes to put your finger on the minor changes in these two Johnny Depp pics?!

Earlier this week, the hot actor hit the Tribeca Festival in NYC and flashed a wave to the cameras, as he made his way through some tatted spectators ... Before the clock strikes midnight and Father's Day is officially here, go ahead and score the differences!