Miss Richie was spotted at the JCPenney spring cocktail jam, hosted by Charlotte Ronson and JCPenny at Milk Studios, on May 4.
Samantha Ronson got behind the mic and guitar and actually sang.
Nicole tweeted: "Tonight you blew me away Samantha Ronson. Your performance with Foreigner was epic. Bravo to you."
The fashionista wore a fringed top, Jet by John Eshaya skinny jeans, snakeskin pumps and a fabulous Chanel bag.