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Gustav - who is Queen Margrethe 's nephew - and Carina both 55, had their first child via a surrogate in the US last year and they were both present during the childbirth. Now they have had a daughter.
Prince Christian, 17 - who is the son of Crown Prince Frederik and Crown Princess Mary - is one of the six godparents baby Gustav will have; following a Christening at Berleburg Castle in Germany.
The couple, both 54, have been together for over 19 years and married in a lavish ceremony in Germany last summer.
The nephew of Denmark's Queen Margrethe and Greece's Queen Anne-Marie - who married his partner of 19 years in Germany last summer - is even said to have a nursery and nanny.