Nicole Richie's hairdo makes Rihanna.... puke?

Nicole Richie

How's this for flattery -- Rihanna just tweeted a pic of Nicole Richie with a caption that reads, “This b*tch makes me throw up" ... and she meant it AS A COMPLIMENT!

RiRi was commenting on a recent pic of Richie sporting a short grey hairdo, above, -- taken at the Met Gala, where the theme was "punk."
How does this translate to a compliment? Turns out, Rihanna meant the outfit was "sick" -- in a good way -- and she even included the hashtag, "#bestdressed."
Next time someone says you make them feel queasy -- just say "thanks." lol

What's your take on the hairdo?