Nikki Reed & Paul McDonald: Rock 'n' Roll Marathon & 1/2 Marathon!

Nikki Reed is all smiles participating in the 2012 Zappos.com Rock ‘n’ Roll Marathon & 1/2 Marathon on Sunday (December 2) in Las Vegas.

The 24-year-old actress was joined by her husband Paul McDonald at the marathon, which benefited the Crohn’s & Colitis Foundation of America.

PHOTOS: Check out the latest pics of Nikki Reed

After the marathon, Nikki tweeted, “Done! 13.1 miles in 2 hrs 25 min 18 seconds! Go @NathanReed_I_am @thePaulMcDonald Manu and Brian! @RunRocknRoll #RnRLV.”

The Crohn’s & Colitis Foundation of America’s goal is to search for cures and encourages organizations to educate the public on Crohn’s disease and ulcerative colitis.

10+ pictures inside of Nikki Reed and Paul McDonald taking part in a marathon…