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Cersei Lannister, is that you?!

"Game of Thrones" star Lena Headey hit the beaches in Ibiza over the weekend, reminding us all how different she and the rest of the HBO show's cast look out of their middle age costumes.

Sporting a skimpy bikini instead of a regal robe and rocking her natural brunette, short 'do in place of her character's long blonde tresses, the 40-year-old put her fit physique on display as she went for a swim.

VIDEO: Watch Lena Headey's Drunken Insult War with Jimmy Kimmel

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The actress also showed off her surprising collection of tattoos, including one giant piece covering a good portion of her back.

See more of her sparrow and floral ink here.

"It's funny how tattoos seem to scare people," she told Esquire last year. "There's something about it that I love. I find it calming. At the end of the day, you're just decorating skin. I hate seeing myself covered up."

Check out the gallery up top to see more surprising "Game of Thrones" transformations -- and the other launch button for more inked up stars.

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