Hollywood couple Reese Witherspoon and Jake Gyllenhaal are reportedly househunting in London.

The Rendition co-stars, who have been dating since last year, are said to have been viewing a number of properties, both apartments and townhouses, in the upmarket area of Mayfair.

According to the Chicago Sun-Times newspaper, Witherspoon is particularly keen on finding a home safe enough for her two young children, from her marriage to actor Ryan Phillippe.

A real estate source tells the publication, "Reese was extremely concerned about security issues.

"She seemed to particularly like places where they could enter and exit not directly onto the street. That's not always an easy thing in Central London, especially Mayfair. But we were able to come up with a couple of places both she and Jake seemed to like."

Gyllenhaal is currently in the U.K. filming scenes for his new movie Prince of Persia: The Sands of Time.