Posted on Sun May 23rd, 2010 8:00am PDT
We've never noticed Justin Timberlake to be particularly buff but we're starting to realize the boy's buffing up!
Just look at those biceps and delts as she swings his golf club ... Sexy's Back!
Oh, hold on ... we do remember one SUPER hot pic of JT hiking ... shirtless ... sweaty ... click thru to check it out!
Almost exactly six years ago, Justin hiking in Runyon Canyon. Not bad!
SEE THE GALLERY Golf Rocks JT's Body
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