Pierre, 29, is the younger son of Princess Caroline (who in turn, is the eldest child of Prince Rainier and Grace Kelly). He and Beatrice, 31, got married in a civil ceremony in July 2015 in the gardens of the Palace of Monaco.
The couple have been the subject of pregnancy rumours for the last few months when Beatrice was pictured with a small bump at the start of August, where she was attending the Copa del Rey Mapfre Sailing Cup awards.
She was last seen out in Milan at the end of October, but she kept her belly hidden with a winter coat.
Congratulations to the happy couple and we can’t wait to find out if the baby will be a prince or a princess!