Di Rupo, 60, is the first francophone will lead a government in Belgium after more than 30 years, writes Agerpres.

Provision oath by the new head of government that succeeds Flemish Christian Democrat Yves Leterme, by the 12 ministers and six secretaries of state will have its place on Tuesday at 15.00, the palace said in a release, quoted by AFP.

Francophone Liberal Didier Reynders, 53, based on the Finance, a post which he occupies in 1999 and established his international reputation, Foreign and European Affairs.

He changes his position with the Flemish Steven Vanackere, 47, will be hard task to improve the financial situation of the kingdom in the midst of debt. Rating agency Standard and Poor's lowered on 25 November with a grade level of Belgium, from 'AA +' from 'AA'.

Government's outgoing Yves Leterme was instructed to deal with "current affairs" after falling in April 2010.

It took over 18 months after the parliamentary elections of 13 June 2010 to form a new government, while negotiations were long prevented disagreements between parties Flemish majority in Belgium, and French, that it made ​​the problem even collapse of the country.

Coalition which finally managed to form Di Rupo comprises six parties - the Socialists, Liberals and Christian Democrat, both Flemish and French-speaking - but it excludes the big winner of elections in Flanders, the separatist party N-VA's Bart De Wever, who has already promised a fierce opposition to the new prime minister.