I know that Kate Beckinsale's aren't that big. Least I don't think they are as she refers em to as "Puppies noses". I think she said that in Van Helsing but just letting you guys know, she has a nice one none the less. Want proof?
Check out Underworld Evolution. You can almost see them, least you can see the permimeter or how round they are. But like I said, she's got a nice one for a brit babe.