She won't let a little hard work keep her from flashing that beautiful smile!

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Hilary Duff is feeling the burn, but not letting it show on her face! The 'Reach Out' singer was spotted with fiancé NHL player Mike Comrie leaving the gym recently. Nothing like having a pro sports player to keep you motivated!

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Normally one to fly under the radar, Hilary was snapped by photags hard at work keeping her body fit.
Hilary is currently in production for 'The Story of Bonnie and Clyde' in which she plays Bonnie Parker, but recently played Olivia Burke in a guest staring role on 'Gossip Girl'
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The singer/actress has just added author to her resume, penning a series of young adult books for publisher Simon & Schuster. Her first novel, called "Elixir," is scheduled to be published in hardcover in October 2010.
What do you do to stay fit?