It's a duel of the dreads.

With matching backwards hats, stunner shades and hair length -- both 2 Chainz (35) and Lil Wayne (30) took a moment to pose and point while performing together last weekend in Austin, Texas.

It's a stripped down battle of the buns! 

Here's Justin Bieber (19) live and unclothed during a Thanksgiving serenade to his grandma (left) ... and Harry the Prince of Wales (28) wearing nothing but the family jewels during a naked billiards party in Vegas (right).

NBA player Jason Collins hit the West Hollywood club scene last night ... and ran into former "American Idol" star Adam Lambert at a new place called Hooray Henry's.

It's a showdown of Selena Gomez' prior suitors.

Here's a topless photo that 20-year-old Nick Jonas shared on his social media page (left) -- and an equally skin-filled photo 19-year-old Justin Bieber posted on his (right).

It's a battle of the beltlines!

Here's 23 year-old pop sensation and paddle board amateur Taylor Swift in the Atlantic Ocean (left) ... and 23-year-old Weiner sext-pert Sydney Leathers along the Pacific Ocean (right) -- BOTH rocking high-waisted bikinis recently.

Julianne Hough and "Vampire Diaries" star Nina Dobrev are two of the hottest chicks in Hollywood ... and both were at Selena Gomez's 21st bday party ... but the question is, who's hotter?

Nina Instagrammed the pic Saturday night mid-celebration of she and Hough dressed as gypsies -- per Selena's theme -- and exposing their midriffs ... making everyone with eyes super happy.

29-year-old Blake Anderson (left), 28-year-old Adam DeVine (center) and 32-year-old Anders Holm (right)  put on their best 'Workaholics' costumes and posed for pics at San Diego's International Comic-Con.

It's a battle of the bronze!

A shady looking 67-year-old Sylvester Stallone (left) posed at Comic-Con with 65-year-old Arnold Schwarzenegger (right) to promote their upcoming action flick 'Escape Plan.'

It's a skinny tie showdown!

42-year-old "Mad Men" stud Jon Hamm (left) and 40-year-old "Argo" actor/director Ben Affleck (right) combined their man-machismo to pose together backstage at the 2013 ESPY Awards last night.

Now that the action at the All England Club has finished up, it's time to focus on the important things.

First we have Men's Champion Andy Murray, runner-up Novak Djokovic, and Spaniard Rafael Nadal ...

... followed by Women's runner-up Sabine Lasicki, early-exiter Maria Sharapova, and the ever dominant Serena Williams.

So we gotta ask ...

Proving that age is nothing but a number, 43-year-old Uma Thurman rocked a bikini while hanging with family in France yesterday ... while Paris Hilton did the same while sunbathing in Malibu.

The question is ...

Two hot women ... two tiny bikinis ... but you can only CHOOSE ONE!!

First, "Pretty Little Liars" star Lucy Hale -- she's 24, she's in Hawaii, and she's smokin' hot.

It's a battle of the brunettes! 29-year-old Singer/Actor/TRL groupie Mandy Moore (left) snuggled in close with 33-year-old actor Minka Kelly (right) while hanging at the Annenberg Space for Photography this week.