Richie's look so inspired Rihanna, the 25-year-old pop singer Instagrammed a photo of the style with the caption, "This bitch makes me throw up!!"
Before you take her comment too seriously, Rihanna used the hashtag #bestdressed to let Richie, 31, know that her outfit was "sick," but in the best way possible.
Richie took the compliment, tweeting back a reference to one of Rihanna's latest singles.
Currently shining bright like a diamond, a ruby, & 2 emeralds. @rihanna— Nicole Richie (@nicolerichie) May 7, 2013