They married in the chapel where Henry VIII married Catherine Parr
The son of Prince and Princess Michael of Kent, Lord Frederick Windsor, has married actress Sophie Winkleman in the Chapel Royal at Hampton Court Palace.
The bride, best known for her role as Big Suze in TV's Peep Show, admitted she "wept throughout the whole thing".
About 400 guests, including Princess Eugenie, Lady Annabel Goldsmith, Jane Asher and singer Bryan Adams attended.
Lord Frederick Windsor, 30, 31st in line to the throne, proposed to the 29-year-old on Valentine's Day.
Senior members of the Royal Family, including the Queen and the Prince of Wales, were unable to attend.
But the Duchess of Cornwall's daughter Laura was there with friends.
Other guests included journalist Eve Pollard and her broadcaster daughter Claudia Winkleman, the bride's half-sister.
Henry VIII chapel
The chapel, where Henry VIII married Catherine Parr in 1543, was decorated with white and pale pink flowers, including roses and jasmine garlands.
The bride wore a dress designed by Roza Couture, with a three-metre (nine-foot) train.
The groom was dressed by Hardy Amies - a favourite designer of the Royal Family.
Hymns sung included Be Thou My Vision, Dear Lord and Father of Mankind and I Vow To Thee My Country.
Lady Gabriella Windsor, Lord Freddie's sister, gave a bible reading from the Song of Solomon.
A champagne reception followed, in the Great Hall of the Surrey palace.
Princess Michael of Kent on her way to the wedding
The couple, who have been together for two years, fly to Los Angeles on Sunday - not for a honeymoon, but in time for the bride to start work on a new television series.
A spokesman said the couple turned down a "life-changing" amount of money from a celebrity magazine offering to cover their wedding, opting instead for a more intimate celebration.
A family spokesman said: "It's been a beautiful day - perfect English weather and a couple deeply in love."
Lord Freddie was educated at Eton and Oxford University and now works for JP Morgan's private banking division. He chose 15 ushers for the big day.
Prince Michael is a cousin to both the Queen and the Duke of Edinburgh. He married the then Baroness Marie-Christine von Reibnitz, in 1978.
She was a Catholic who refused to convert to Anglicanism and Prince Michael, eighth in line to the throne at the time of his birth, lost his place in the succession.
Their children, however, retain their rights of succession.