I just had one at Burke Williams in Pasadena. It was long over due and I cannot believe I waited that long. They also offered a free 20 minute soak in the tub with my service. And I am sure that was also Hillary Duff there, too.
The BW in Pasadena is the best one I have been to. SM, SO and Hollywood arent so great, but this location is much nicer.
I too am a Burke Williams Spa person! LOVE THEM!!! I had a post-pregnancy massage there recently and as always - was really great! Don't forget to request a pillow for underneath the breast area if you're sore like I was.
The only prenatal massages I had were in Burbank at Burbank Spa & Garden. They did a great job - it would be worth the drive. It's a nice environment, but they are not as large a place as BW. They don't have the tubs, etc... but still a great place.