Thea, 12, and 37-year-old boyfriend Geir "get married" on Oct 11, 2014.

The "wedding blog" of a child in Norway has gone viral - sparking outrage across Europe. Thea, 12, is seen wearing an engagement ring and wedding dress and writes of a wedding invitation and party foods for her big day.

The pre-teen said she "will soon be married" to Geir, her 37-year-old boyfriend who appears in some of her blogs.

The blog entitled "Thea's Wedding" spread rapidly and the story has shocked millions, but it is not real. It is part of a campaign by the charity Plan International that works to help the "39,000 children every day" who are actually forced into marriage.

The "wedding date" fell on Saturday, coinciding with the United Nations' International Day of the Girl Child.

"We believe provocation is a powerful tool to demonstrate a reality that truly is very provoking," the non-profit organization said in a statement. "We hope people will mobilize against child marriage by being girl sponsors, so that most of the girls facing Thea's situation every day can escape their brutal fate".