This will be the first child for the Princess, 36, and her husband, 56, who wed in 2011.
Prince Albert is the son of Rainier III, Prince of Monaco and the late Hollywood legend Grace Kelly. He has two children from previous relationships: Jazmin Grace Grimaldi, 22, and Alexandre Coste, 10.
No additional details have been made available such as how far along or the sex of the baby.
Congratulations to the happy couple on the wonderful news!