Kate Gosselin's Amazing Race: "So Sore"

Why was reality TV mom of eight in pain after her trip to Las Vegas?

Kate Gosselin did a lot of running around yesterday.

And it had nothing to do with trying to keep up with her eight kids...

The former reality TV mom turned coupon queen ran the Zappos.com Rock 'n' Roll Las Vegas Marathon benefiting the Crohn's & Colitis Foundation of America.

Ms. Gosselin finished the 26.2 miles in 4 hours, 59 minutes and 21 seconds. It was her first marathon.

"A lot slower than I hoped," she tweeted, "but I finished&I'm happy!"

She followed up this morning by tweeting that she was "so sore" last night but less sore today. "Back in heels!:). Yes, ready to start training for the next one."

American Idol finalist Casey Abrams and Pearl Jam guitarist Mike McCready also performed during the event.