Sofia Vergara
is best known as a brunette bombshell ... but how does she stack up as a blonde? Duh, she kills it.

On Tuesday, the Colombian beauty tweeted a photo of her new 'do with the caption, "Blond ambitions!! Gracias to the amazing Kelly Klain Im ready for summer!☀"

Bet you didn't know that the 40-year-old is a natural blonde -- that's probably why she wears the color so well!

How do you think the "Modern Family" star looks with lighter locks? Sound off below and click "Launch Gallery" above to see more stars who've gone blonde and brunette.

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