Hot mama! Chelsea Clinton looked fit and fabulous when she stepped out to take part in a tree-planting activity for Clinton Foundation's Day of Action in Palm Springs, Calif., Sunday.

Just four months after giving birth to daughter Charlotte, Clinton showed off her slimmer post-baby bod in skinny jeans. She paired them off with a casual blue T-shit and brown cowboy boots.

The new mom looked thrilled as the host for the volunteer event put on by The Clinton Foundation Day of Action.

She and other volunteers planted an orchard, painted benches and fixed up other equipment at the James O. Jessie Desert Highland Unity Center, according to Daily Mail.

Last September, the 34-year-old and her husband Marc Mezvinsky welcomed their first bundle of joy, Charlotte Clinton Mezvinsky.

The only daughter of Bill Clinton and Hillary Clinton also opened up about being a new mother on Sunday.

"I'm a new mom," she said during her speech. "And I didn't know that I could care any more about the issues that I already care about like health and wellness until I became a mother and until I had a daughter."

And she's not the only one smitten with her daughter. Clinton told PEOPLE magazine that Charlotte's grandparents just love doting on her!

"We all kind of compete to see who's going to read her stories," Clinton said. "And even though she personally didn't care for Hillary's singing voice when she was a little girl, Chelsea says she "love(s) watching her sing to Charlotte" now!

Clinton also gushed about her little girl during an interview with Yahoo News last November.

"I'm so happy. It's even better than everyone had said it would be. And now I understand everything everyone say about their children. It's just magical," she told Katie Couric.

"Not a lot, but that's okay," she added of getting no sleep. "I exist in this twilight, but every moment with her is amazing, whether it comes at 2 a.m. or 2 p.m."