British actor Ewan McGregor, in WA filming crime thriller Son of a Gun, last night made his first public appearance since arriving in Perth.

He was at Tiffany & Co for the launch of Polo in the Valley.

McGregor said he was enjoying Perth but had been working hard and had not had a chance to see many of WA's tourist attractions.

The 41-year-old star of Trainspotting and the Star Wars prequels has spent a lot of time at maximum-security Casuarina Prison, where Son of a Gun is being filmed.

His character is described as a seasoned armed robber who takes a small-time thief under his wing to pull off an audacious heist.