Maybe it is love that's making her glow or maybe it's the work-out she just had?  Either way, Reese Witherspoon was looking sensational Friday in L.A.'s Brentwood neighborhood as she stepped out of her gym, Burn 60.

Reese was there for a spinning class with her BF Jake Gyllenhaal, who has long been one of Hollywood's fittest hunks. 

BTW -- catch Reese's traditional tote bag with her initials -- LRW - Laura Reese Witherspoon.

(Photo:WENN)

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• Jaky Gyllenhaal
• Reese Witherspoon