Ashton Kutcher and his girlfriend Mila Kunis are renting a London flat next to a 'dogging' hotspot.

The 'Dude Where's My Car' star and the 'Black Swan' actress have moved into the luxury abode in Hampstead, North London while the brunette beauty shoots her latest movie, 'Jupiter Ascending', but the property is located next to a car park which is notorious for people engaging in public sex.

A source told The Sun newspaper: ''Mila has come over to London ahead of Ashton to start shooting.

''Ashton has a bit of time between projects so has decided to relocate to London and house-sit while Mila is at work. They originally planned to move more central to Marylebone but she fell in love with Hampstead when she had a day off there with some friends.

''The apartment they have is opposite a notorious car park on the heath which is well documented on the internet as a site for voyeurs seeking thrills with strangers.''

Despite the chance of an unwanted sexy encounter, Ashton may feel it is better than the possibility of an awkward meeting with Macaulay Culkin, Mila's ex of eight years, which he narrowly avoided earlier this week.

Ashton was spotted departing a hotel in London's Covent Garden just a few streets away from where the 'Home Alone' actor was walking.