There's nothing like a party for a good cause.

Groovy: Nicole embraced 70's chic in high waisted pink pants and a red camisole

And Nicole Richie was ready as ever to lend a helping hand, hosting a charity event with Project September in Hollywood this week.

The 35-year-old celeb invited LA's most stylish residents to the Roosevelt Hotel Garden to raise money for Planned Parenthood with an evening of fashion, fun and friends.

At the summer festival inspired event, the Candidly, Nicole starlet looked 70's chic in a red camisole and bubblegum pink trousers, all from her line House Of Harlow.

The Berkeley-born star jazzed things up with a pair of heart shaped sunglasses, while striking a pose in front of the palms of the Roosevelt's garden.

The mother-of-two's blonde locks were styled in a chic bun spun from a fishtail braid, while Nicole opted for low-key glamour, donning simple contour and glowing skin.

The champagne was flowing at the exclusive shopping event, where LA fashion influencers donned their favorite LA inspired looks to shoot Project September's Festival Lookbook in support of Planned Parenthood.

Bloggers Sheryl Luke, Bethany Marie, Marie von Behrens and more attended to kick off festival season at the spring soirée as DJ Lindsay Luv spun tunes.

Nicole made her rounds, laughing and taking selfies with party guests while embracing festival spirit in the Hollywood garden.

A portion from every purchase from Project September's festival lookbook was donated to Planned Parenthood

Project September is an immersive, visual shopping site featuring the best of global fashion brands, designers, and influencers.

Nicole's line House Of Harlow is featured on the site, alongside selections from Saks Fifth Avenue, Nasty Gal, Nike and more.