Kristen Stewart's 21 Sexiest Pictures to Celebrate Her 21st Birthday!

Kristen Stewart is celebrating a big milestone on Saturday — the Twilight star is turning the big 2-1! We're taking a look back at some of the beautiful actress's sexiest looks and moments for her special day, from her steamy on- and off-screen chemistry with Robert Pattinson to her hot and leggy red-carpet looks. We're excited to hear how she's celebrating, and the timing coincides with a major work milestone: they are filming the Breaking Dawn wedding scene this week, so it's a huge moment for both Bella Swan and Kristen Stewart. Last year we took a look back at her career from the start, including her famous pot leaf bikini and early red-carpet style. Click through to see our top 21 pictures of the star from recent....

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