Kate Winslet was only 21 when the then relatively-unknown actress hit it HUGE with "Titanic" back in 1996 -- and since then, she's evolved into one of the most respected and fashionable actresses out there.

Winslet, who picked up an Emmy last month for her work in "Mildred Pierce," celebrates her 36th birthday today ... and to mark the occasion, we're taking a look at how her personal style has changed as fame her grew.

From her humble red carpet beginnings to her A+ looks today, check out Kate's transformation from ingenue to superstar.

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