It looks like Nicole Richie has hired Jessica Biel's stylist, Cristina Ehrlich, after firing Rachel Zoe, her sidekick stylist for the last two years.

Rumors are buzzing that the firing was due to some sort of "trust issue" and that Zoe didn't take the news very well:

"Nicole didn't trust Rachel anymore," said a friend of Richie's of last Tuesday's firing. "Zoe didn't take the news well."

Lasrt night, Ehrlich dressed Nicole for the American Music Awards.