But Wootton said with the type of gossip he used to write, Grant did not feature often because "he didn't seem to enjoy being a celebrity". Stars were entitled to privacy.
Wootton now writes a column and does celebrity interviews and features for the Daily Mail, has a segment on breakfast television and writes for a weekly magazine.
But he had three years with the News of the World, closed down last year in the wake of the phone hacking scandal.
Talking to the Herald on Sunday after his appearance, he said he had felt comfortable. "There was a clear understanding on behalf of the QC who was questioning me, as I wasn't at the paper at the time when a lot of the alleged activities were going on and even if they had of been, that was completely not the sort of journalism that I did."
He was asked on the stand about the New Zealand press regulatory system.
He said there had been few complaints about his work on News of the World. "The sort of journalism I did, nine times out of 10 I was dealing with people who wanted to be written about and to some degree at the very least had an understanding of the press."