My best friend was my birth partner for my DD. She was pissed, embarassingly so, the night before and as she is normally the sensible one, regretted it the next day.
She was fantastic though. My husband had done one and didn't want to be there a second time. She cried at the right crying places, and sat there dumstruck when DD was placed into her arms. Awwwwwwwwwwwwww