Official answer = three: Filip, Astrid, Laurent
About Laurent there are hard rumours that Albert is not the father.
And it is well-known (but still officially denied) that artiste Delphine Boel is a daughter of Albert.
King Albert II (the second) and Queen Paola
The name of the current queen is Queen Paola, wife of King Albert II.
Queen Paola of Belgium was born on September 11, 1937.
Queen Paola of Belgium was born on September 11, 1937.
King Albert II, and Queen Paola.
Queen Paola of Belgium is 79 years old (birthdate: September 11, 1937).
Isn't Paola the Queen of Belgium? Also, Monaco has no king or queen.
King Albert 2 and Queen Fabiola
Queen Paola's birth name is Donna Paola Ruffo Wettin.
Queen Paola Foundation was created in 1997.
Prince Albert was the husband of Queen Victoria, and the father of all of her children. See the related question below.
Queen Victoria and Prince Albert had nine children together. However, King George III and Queen Charlotte had 15 children.