Tracy Anderson was invited at Nicole Richie's small party in honour of her spring 2011 House of Harlow and Winter Kate collections at Bergdorf Goodman in New York City, on February 9.
The celebrity trainer wore two pieces from Nicole's jewelry line - a starburst necklace and a matching cocktail ring.
Tracy revealed that Nicole is an unbelievable dancer and they have a little project in the works.
House of Harlow 1960 starburst cocktail ring
House of Harlow 1960 starburst necklace