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they have the one at the Bev Center (closed mall), one in the Century City mall (open mall) which is about 10 mins drive from Bev Center, then there's Rodeo Drive which is in between the two (location wise). I personally have never been to the one on Rodeo as I would never take my kids down there and they are usually attached to my hip. It's a pain in the butt to park down there, street parking only (bring lots of change) and most of the stores are really expensive. Also it depends on if it's raining or not. If you prefer to be in a mall, check out the other two:
Beverly Center
Westfield Experience the New Century
I highly recommend going to Tiffany & Co. too which you can find either at Rodeo or Century City mall.
There is also one at the Hollywood & Highland mall which IMO is a sucky mall and not worth the time unless you are going to be going down the Walk of Fame or to Mann's Chinese Theater, then go there. And if you are going to be in Orange County, the one at the South Coast Plaza is nice!