Abbey has been able to roll from her tummy to back for about a month now, but just started rolling from her back to her tummy yesturday!
DH had mentioned something about it when I got home from work as he had been playing with her on her play mat. I didn't get to see it for myself until we put her bed last night and she was moving all over the place in her crib. Thanks to her monitor, I finally got to see her do it (because of course she refuses to roll when I'm around LOL).