About the Paparazzi getting pictures of celebrities ...

Here in the USA, public figures have a little less protection than the rest of us -- in order for them to sue they have to prove 'actual malace' on the part of the photographer. 

OTOH, it is my certain understanding that in public (i.e., on the street/sidewalk; or an automobile driver on a public right of way) there can be no presumption of privacy.  e.g., the photo could have been evidence of public drunkeness ... IOW, could the subject have suppressed that photo as evidence because it showed her in a bad light? 

... then again, I'm neither an attorney nor a judge. 

--
Martin