I really like the color of Nicole Richie's bag. What color is it?
Hmm. I'm not sure. Knowing me, I would call up and say it was a yellow Muse. I'm sure there can't be that many yellow colored muses out there.
I think that might actually be a yellow suede YSE bag which is VERY similar to the Muse.
If you look at the two versions on NM.com, you'll get a feel for the "differences":