Nicole Richie turned 31 on Friday, and she spent it with a mellow crowd of friends at Katsuya in Studio City for some great sushi.
Kim Kardashian, whose reality show was shot in Studio City and frequents Ventura Boulevard a lot, sent Richie a photo of them at Nicole's 14th birthday and writing:
"Happy birthday to my friend Nicole Richie. Many of you [may] not know that we've known each other for many years. I found this pic of us at Nicole's 14th birthday party! Awww, the memories!"
For more photos, click here.