Britney Spears launched her European tour with an exclusive party in London last night (16.09.11).

The 'Criminal' singer turned up at the Sanctum Soho Hotel with boyfriend

Jason Trawick looking stunning in a green-and-black bodycon dress to celebrate the start of the European leg of her 'Femme Fatale' tour.

The series of concerts start in St Petersburg, Russia, on September 22 and end in

Lisbon, Portugal on November 9 and will see Britney returning to London for dates at the city's The O2 venue in October.

Britney, 29, arrived in the British capital earlier this week and said it is a city that is always close to her heart.

She tweeted: "So excited to stop over in the UK before I start my European tour in a few weeks. Can't wait! I LOVE London, it's like my second home."

She will also shoot her new video for 'Criminal' in the UK capital, adding: "Decided to shoot the Criminal video in the streets of merry old

England when I get there."