Whatever you do, don't look at the legs in the background.

This year's Sports Illustrated Swimsuit Issue cover girl Kate Upton and last year's cover girl Irina Shayk proved they looked hot in clothes too at an event in Las Vegas on Wednesday.

Question is ...

Let's put it this way..... someone should replace that dog Mona Lisa with Irina Shayk's most recent nude photo shoot ... it would definitely boost ticket sales at the Louvre.

The photo (ink tragically included) adorns a new coffee table book commissioned by Diddy and Interscope chairman Jimmy Iovine -- featuring lots of hot chicks from all over the planet -- to honor the female butt.

It's called "CULO" -- Spanish and Italian for ass -- and it's out next month.

It's definitely aspirational.

Soccer stud Cristiano Ronaldo and his smokin' hot model girlfriend Irina Shayk turned up the heat on the beach in Portugal by wrapping their tone, tan and wet bodies around each other.



It's rough being beautiful.

S.I. cover model Irina Shayk must've left her Lady Bic in Russia ... because her legs are hairier than her BF Cristiano Ronaldo's ENTIRE BODY! Not that anyone's kicking her out of bed for it...



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

Taking a cue from Mo'Nique, Sports Illustrated cover girl/Cristiano Ronaldo's super hot girlfriend Irina Shayk proudly showed off her sexy hairy legs in L.A. on Tuesday.



This pic is a little fuzzy.

Sports Illustrated cover girl Irina Shayk, 25, and her Swimsuit Issue fellow stunner Brooklyn Decker, 23, both put on clothes to attend a party for the magazine in NYC on Tuesday.



Question is ...

Soccer stud Cristiano Ronaldo has a strange custom -- keeping smoking hot SI Swimsuit Issue covergirl Irina Shayk 10 feet behind him. Closer than we'll ever get, but dude ... really?



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

Not bad, right?

Hot futbol stud Cristiano Ronaldo and his even hotter girlfriend Irina Shayk were spotted being hot together in Spain on Thursday.


Together they are on team Unreal Madrid.

Soccer stud Cristiano Ronaldo turned his back on his smokin' hot girlfriend Irina Shayk as she showed off her bikini body at a pool in NYC on Wednesday.



She may not be a California gurl, but Irina's definitely toned, tanned, fit and ready.