The former BallonD'Or winner took his oath of office inside the Samuel Kanyon Doe Sports Complex in Monrovis, in an event that had several African head of states and football stars present
I have taken an oath before you and before Almighty God . Rest assured I will not let you down".
"This is your government."
Weah won Liberia's presidential election in December, after securing 12 out of 15 counties in the west African natiin, thus succeeding Ellen Johnson Sirleaf.
The 1995 Fifa Ballon d'Or winner and three time African Player of the Year defeated 73 year old Boakai to become the country's 24th president.
Weah succeds Ellen Johnson Sirleaf, who is the first elected female head of state in Africa.
This transition of power represented the country's first in 47 years.
Present at the event were former Nigeria President Olusegun Obasanjo, Senate President Bukola Saraki, Governor Rochas Okorocha, JayJay Okocha amongst others.