Amaya, you are not kidding!
You've cited some of my fave examples of multiples mamas (and daddies ;) ) in the public eye. Some others that pop to mind are Marcia Gay Harden, Holly Hunter, Geena Davis (all Oscar winners!) and Oscar nominee this year, Tilda Swinton.
You know there might be something to your "so public" theory...Tilda Swinton's twins are 10...perhaps it's more of a "spectacle" with celebrity babies now. Cybil Shepherd has "older" twins, too...
Even with all we've named here, I'm sure there are more...
Nice to see you on the boards, hope to get to know you better! :)