Reality TV star Kim and 'Avatar' actress Zoe volunteered at the Los Angeles Mission where they donned red aprons to serve the needy ahead of the traditional US holiday, which takes place today (24.11.11).
A representative told UsMagazine.com that Kim "was very cordial and friendly" during her shift and "worked hard in both the food preparation area and in serving the food to the guests".
Kim - who split from husband Kris Humphries after just 72 days of marriage at the end of October - later tweeted that she had met "many kind-hearted people" during her stint volunteering, adding: "We fed so many today, [but] their goal is to feed 120,000 people by the end of the year.
"Every One Of Us can do something small that will make a huge difference to someone else."
Zoe - who split from her fiance Keith Britton after 11 years together earlier this month - also urged her twitter followers to donate to the cause.
The 33-year-old actress tweeted: "@TheLAMission rt now. Est. to feed approx 4k people. We could feed more if u log on to feed LANow.org & donate! Happy Thanksgiving!"
The Los Angeles Mission has provided shelter, food, clothing and professional medical and dental services to the homeless for over 75 years, as well as helping needy people integrate back into society.