Article continues below advertisementFormer Prince Andrew recently celebrated his 66th birthday, but his most extravagant birthday remains his 40th, which reportedly cost £30,000, or approximately $38,000. Royal biographer Andrew Lownie shared these details in his book, Entitled: The Rise And Fall Of The House Of York.Article continues below advertisementSource: MEGAEx-Prince Andrew's 40th birthday reportedly cost $38,000.Article continues below advertisementLownie recalls the lavish celebration in 2000, co-hosted by Andrew's ex-wife, Sarah Ferguson.