A few days back, he turned up at the sleepy Dulwich Picture Gallery to look at an exhibition of Beatrix Potter memorabilia.
Staff was told that McGregor was there on the recommendation of Renée Zellweger, who also visited recently.
"Ewan's about to co-star with Zellweger in a film about Beatrix Potter, and dropped in on his own, wearing leathers," says the gallery.
"He said he didn't want any fuss made and was happy just to wander round on his own for an hour or two. "
Sweetly, a curator decided to present the Hollywood star with a memento of his visit. It was a Peter Rabbit notebook bearing the slogan: "You may go into the field or down the lane, but don't go into Mr McGregor's garden."
Source: The Indepedent