Prince Andrew s daughter wore the Disney costume to a party at her father s Windsor home, Royal Lodge

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Hi-ho-hi-ho: It s off to party the royals go.

Princess Eugenie, the younger daughter of Sarah “Fergie” Ferguson and Prince Andrew, hosted her own cartoon-themed celebration to mark her 25th birthday – and it was a doozy.

The royal, whose actual birthday was March 23, celebrated on Saturday at Royal Lodge in Windsor, her family’s home.

For the fancy dress bash, Eugenie opted for a Snow White costume – and reportedly hired smaller-statured actors to play her “dwarves.”

Her cousin Prince Harry was spotted entering the grounds – but without his costume, which was said to be Super Mario-style.

Fergie – who also rooms at Royal Lodge with her ex-husband and enjoyed a family day out with Andrew and their daughters at Royal Ascot on Friday – came dressed as Jessica Rabbit, a source close to the family confirms to PEOPLE.

It s thought that Eugenie s older sister Princess Beatrice, 26, appeared at the party as a character from Finding Nemo. (Maybe fellow redhead Darla?)

And Harry, 30, who heads off to Africa for three months of conservation work any day now, is likely to have met up with friendly ex Cressida Bonas at the bash. The actress is close with Eugenie (she introduced them) and was bound to be invited to the party.

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For Eugenie, the party was also something of a homecoming as she starts a new job in London this week. She has been headhunted to be associate director at Hauser and Wirth, a contemporary art gallery, the family source tells PEOPLE.

She had spent the last two years in New York where she worked at online auction house Paddle8.

That means she is swapping places in a sense with her older sister Beatrice, who is due to settle in New York City to start her job in the world of finance “in the coming weeks,” the source adds.

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