Emmy Rossum Celebrates National Bikini Day In A Classic White Number

07/09/2014 10:29 am ET | Updated Jul 10, 2014

Emmy Rossum is celebrating National Bikini Day in style.

The 27-year-old star took to Instagram on Saturday, July 5, to share a photo of herself lounging in a glamorous white 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," the actress wrote in the caption.

The image comes just days after Rossum shared via Instagram a bikini throwback picture in honor of July 4th:

Rossum, who stars as the gritty Fiona in Showtime's "Shameless," revealed last year that producers were reluctant to see her audition for the character because they thought she was "too glamorous." While she eventually snagged the role with her supreme acting talent, it's not hard to see why they may have had the wrong impression.

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