Branka Katic played Ana on HBO's Big Love.  Ana was a potential fourth wife for Bill during season three, but things did not work out between the five (Bill and his current three wives, of course).

Big Love Quotes

Sarah: Why can't we just hire a babysitter like everyone else?
Barb: Because we're not everyone else

Margene: Does that mean you miss me more?
Bill: Officially... I miss you guys all the same.