I'm always finding myself late to these sorts of things I'm afraid so I've really only just found out about these Antonella Barba nude pictures. (There are some of someone purporting to be her having sex as well).
She's a contestant in American Idol and she did some professionally posed cheesecake shots. Good looking girl but there's still a streak of the Puritans in American life. Someone who has bared their breasts should not be allowed to sing or something (although they can if they're already famous, as Madonna has shown).
Something that did create real (rather than simulated) outrage was that the posing was done atop a war memorial.
As to the sex pictures, well, unless she's had significant surgery, it doesn't look like that's actually her.