A German teenager fled her own 16th birthday party after more than 1,500 guests turned up after she forgot to set her birth date as 'private' on Facebook.The girl, named only as Thessa, hid as the huge crowd - followed by 100 police officers - converged on her house in Hamburg.Partygoers held signs asking "Where is Thessa?", chanted: "Thessa, celebrating a birthday is not a crime", and brought birthday presents and homemade cupcakes.But Thessa was nowhere to be seen and police confirmed she "was not at home". She is believed to have celebrated quietly at her grandparents' house.Thessa had only wanted to ask a handful of friends over to her home but mistakenly put the event to 'open' and 15,000 people confirmed they would attend.When her parents found out, they made her cancel the party, told the authorities what had happened and hired a private security firm to protect their home.Despite public announcements across the city that the party had been cancelled, 1,500 teens and young adults still turned up on the street in front of Thessa's homePolice spokesman Mirko Streiber said: "We had cordoned off the house, some 100 police were on the ground, four of them on horses - but that did not keep the kids from celebrating."Source: orange.com