Mila Kunis in a Pretty Polka Dot Dress

Unlike a lot of American celebrities who can't get enough of our country, Mila Kunis is a very rare visitor to these shores.

The last time she was here was ten months ago when she flew over for the Black Swan premiere in London in October so it was really nice to see her here again.

And she was clearly prepared for our heatwave this week as she stepped out in a pretty polka dot dress in central London.

Mila, 27, looked very summery as she arrived at the Radio 1 studios today to promote her new film.

She stars in Friends With Benefits alongside Justin Timberlake and both of them have been on a promotional tour for the film around Europe.

They have visited Russia, Germany and France to promote the movie, which is released at the beginning of September.

But today Mila was on her own as she arrived at the radio station alone.

She teamed the dress with towering nude heels and a pretty light blue clutch bag as she was ushered inside the building.

And the actress, who shot to fame in the sitcom That 70s Show, looked radiant, but that was either the sunshine or her recent $7,000 facial.

Mila indulged in the expensive and lavish beauty treatment before the Germany premiere last week in Berlin.

The facial took place at the salon of aesthetician to the stars, Scott-Vincent Borba.

The procedure, called the HD Diamond and Ruby Peel, uses precious stones including rubies and diamonds that work as antioxidants for the skin and, according to Mr Borba, create a ‘lustrous sheen.’