I didn't know:
http://news.com.au/common/story_page/0,4057,9581242%5E13780,00.html
Mary agreed to pre-nuptial
By Ben English in Copenhagen
May 17, 2004
DENMARK'S Crown Prince Frederik declared his undying love for his new princess – but he still took out last-minute insurance.
The future king moved to protect the vast riches he will inherit should his fairytale marriage to Hobart-born Mary Donaldson end.
Royal attorneys filed a pre-nuptial agreement, signed by both Prince Frederik and the now Princess Mary, minutes before the registry closed at noon on Friday.
"At the court in Aarhus . . . we received a signed marriage settlement from both Frederik and Mary," registry Judge Soeren Soerup Hansen said. "We just had time to record it in the registry so all formalities are now in order."
The agreement, called a settlement in Denmark, was lodged so late the court has yet to stamp it.
Judge Hansen said the document was still valid because it had been recorded in the register.
Had Prince Frederik failed to lodge the settlement, he would have been liable if the couple divorced to hand over half the "kingdom" to his bride under Danish law, which stipulates an even split of assets.
Under the settlement, Prince Frederik's existing riches will be safe from any divorce payout.
His assets are a closely-guarded secret but he is believed to be already independently wealthy.
After the wedding, Prince Frederik, who is honeymooning with Mary in Tanzania, receives a pay rise from $940,000 a year to $3.21 million, of which his wife will receive 10 per cent.
The Queen has given him a palatial 4 700 sq m wing of Amalienborg Castle in Copenhagen plus the vast Kansilli House, part of the sprawling Fredensborg Castle, 40km north of the capital.
An average two-bedroom 75sq m apartment in Copenhagen is worth about $400,000.
Using this benchmark, Prince Frederik's lodgings are worth more than $25 million.
In registering a pre-nuptial agreement, the Crown Prince followed the same cautious path as his mother and brother ahead of their marriages.
But prior to their marriage, Mary made it clear she had settled on a career for life – as Crown Princess of Denmark and eventually to be promoted to queen of one of the world's oldest monarchies.
When her father John Donaldson gave her away, he literally handed his youngest daughter over to Denmark.
In the event of divorce, she will relinquish the custody of any children to Prince Frederik.
On Saturday, the couple departed on their honeymoon – in search of warmer weather in the wilds of Tanzania.
The couple chose a honeymoon destination as far from the urban jungle – and from the prying eyes of an obsessed Danish press – as possible.
In elaborate plan involving two planes to trick the media, the couple travelled to Dar Es Salaam, the capital of Tanzania on the coast near the famed island of Zanzibar.
Dar Es Salaam is often used as a staging point for holidaymakers on their way to Zanzibar's pristine tropical beach resorts. It is also renowned for its diving, one of Frederik's favourite recreations.
Tanzania also boasts Africa's tallest mountain – Mt Kilimanjaro (5 895 m) which can be seen from almost anywhere in the country – and an array of safaris to see the continent's wildlife up close.
Frederik and Mary broke with a tradition reaching back to his late grandmother Queen Ingrid, who spent her wedding night aboard royal yacht Dannebrog.
It is not known how long the honeymoon will last, although one of Frederik's best friends among the European royal community – Spanish Crown Prince Felipe – will be getting married next week.
The Daily Telegraph