Emmy Rossum celebrated National Bikini Day in a sexy bikini

Did you know Saturday was National Bikini Day? Emmy Rossum did.

Emmy captioned this VERY hot photo of herself in a bikini, “Happy National Bikini Day! The bikini has been stringing us along since July 5th, 1946 when it was invented by Louis Reard, a Parisian fashion designer. #STRINGINGusalong #SeeWhatIDidThere? #bikini #UselessInfo #LearnedItOnWikipedia.”

Related: It’s Emmy Rossum’s turn to be sexy in a bikini while sitting on a swan

Also, for Throwback Thursday last week, she posted this bikini pic from a year ago because she’s doing her best in the unofficial battle with Jennifer Lawrence to be America’s Sweetheart. Since J-Law isn’t on Instagram and Emmy is posting bikini pics I’d say she certainly wins this round.