Brueckner, who is currently on trial accused of carrying out separate sex attacks on women and children in Portugal, was said to have met his ex-girlfriend on the dating site in 2013.
Christian Brueckner, a German national, is the prime suspect in the disappearance of Madeleine McCann in Portugal in 2007, but he has not been charged with her disappearance.
The party was one of many that took place at Christian Brueckner s rented kiosk, his last registered address, on the Altstadtring inner ring road of the German town of Braunschweig.
German police probing convicted paedophile Christian Brueckner (pictured) reportedly have until the new year to find a new lead before their investigation falls through.