What episode was the one where it was Grey's Anatomy and Private Practice at the same time?

season three of Grey's-not sure of the name probably like "The Move" or something. I'm not quite sure what was going on last season. I'm a Grey's Anatomy fan myself. Addison can go on her merry way-hope she does good but it's not "must see TV" for me.

The Other Side of This Life | Air Date: 08/24/2007

Addison takes a leave of absence to visit her old friends Naomi and Sam in Los Angeles, a couple who work at the Oceanside Wellness Group. She immediately thinks of Seattle Grace when the first person she encounters at the co-op is a hot guy in the elevator.

However, Naomi isn't exactly pleased to see her since it's been more than a year since they talked. Addison says she's had a lot going on, such as the divorce, and Naomi tells her she and Sam are also divorced. Sam is now a medical guru with a best-selling book. Addison is surprised to find that they still work together.

"The Other Side of This Life"