Nina Agdal vs. Emily Ratajkowski Bikini Instagram PHOTOS: 'Sports Illustrated' Models Hot & Steamy Summer Beach Pics Go Viral

It's officially summertime - which means Instagram's now chock-full of sexy bikini selfies!

Two "Sports Illustrated" hotties recently shared stunning swimsuit snapshots on the popular social networking site. Emily Ratajkowski soaked up the sun while flaunting a cleavage-enhancing, floral-print bikini top in Italy:

emrata: "Summer in Italia."

Stunning.

Then there's fellow model, Nina Agdal. The 22-year-old blonde beauty's sun-kissed photos just posted over the weekend are currently going viral:

ninaagdal: "Happy saturday! Thank you @OpOceanPacific for my colorful bikini."

ninaagdal: "Boo @benjaminthigpen."

Both ladies look absolutely gorgeous while enjoying some relaxing, summer fun. Admit it - we totally envy them!

Which model flaunted the sexier bikini body?