Rebecca Thomas from Sutton Coldfield is stranded on the Costa Allegra which was left drifting after losing power in the Indian Ocean.
Her brother James, who is also a dancer, escaped from the Costa Concordia when it capsized in Italy last month, killing 25 people and leaving seven more missing.
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She was dropped by British Cycling/UK Sport after she criticised coaches for mistakes made in qualifying for the Rio Olympics.
It's the superstar's first UK tour in more than fourteen years.
The Banquet gown was among a collection of royal outfits donated to the shop.