She's so dedicated to working on her fitness! And we're willing to bet that she hits the gym on Thanksgiving day too...

On Wednesday morning Nicole Richie was snapped leaving her workout in Los Angeles, and as usual the starlet covered up her sweaty bod with a leather jacket. She must have an insane dry cleaning bill!

Yesterday Nic took her daughter Harlow to The Coop in Studio City to celebrate Bronx Wentz's fourth birthday, and while Pete Wentz, Ashlee Simpson and several other famous faces were on hand, noticeably absent was Nicole's Fashion Star counterpart Jessica Simpson. Coincidence?