Writing etiquette - a question

Hi all,

I have a question about the use of real people and their names in a fictional story.

Is it the normal practice to misspell names that belong to real people - I assume to then be able to have some 'plausible deniability'?

I noticed in a recent story that two well-known actresses names were used (amongst other names of real persons) and that these names were incorrectly spelled. I could accept one as just being a typo, the sort of error to which we are all prone, (it was "Jollie" as opposed to the correct "Jolie") but when the second came along even more mangled, then it made me wonder if this was something that it is generally 'to be done'.

So I just thought I would ask.

Thanks in advance.

Di.