of course she's a lesbian
She came out via "gaydar" many years before. I know she's private which is GREAT in Hollywood, after all, the tabloids are all over the place in peoples lives.
What surprised me was that I have always read her as a soft-butch type, like my life partner, and it surprised me that she would carry their children. Not to delve into sterotypes too much, but it seems that the femme carries more often, from what I have noticed. However, that is the awesome thing about have a lesbian relationship, if one can't or does not want to carry, there is another partner who can give it a go.
Don't be afraid, it's only love!