Princess Beatrice throws adorable unicorn-themed birthday party for daughter Sienna

Princess Beatrice, who just announced a pregnancy, celebrated her eldest daughter Sienna's third birthday last week.

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Princess Beatrice is expecting again (Image: Getty)

Princess Beatrice celebrated daughter Sienna's third birthday last week with an adorable unicorn theme, including a gift from the toddler's grandmother Sarah Ferguson.

The humble birthday party also featured a cake from Tesco for Sienna, who has never been pictured with the royals, as per Princess Beatrice and husband Edoardo Mapelli Mozzi's wishes.

Beatrice's mum, the Duchess of York, said she got litle Sienna a pink coat which she loved and her party guestlist also included Princess Eugenie, Jack Brooksbank and their two sons August and Ernest.

The birthday party comes as Princess Beatrice, who is said to be a "fantastic mum", announced she is pregnant with her second baby. 

The couple, who share Sienna as well as Edoardo's son from a previous marriage, Christopher Woolf aka Wolfie, said their family is getting bigger, as Princess Beatrice is expecting.

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Sarah Ferguson told Hello! magazine: "We had such a good time, with balloons and a fabulous unicorn cake from Tesco...I also gave her a pink mackintosh with glitter in it and I think mum was thrilled with that!"

Beatrice and Edoardo have only ever shared the backs of the heads of their children, keeping them away from the limelight, and Sienna's birthday was no exception.

Earlier this year, one of Beatrice's friends told Tatler: "Sienna is absolutely gorgeous and looks exactly like Bea. She's really cheeky and has a very good personality...Bea has such a good heart and she's such a kind person, so motherhood came very naturally to her; she's a fantastic mum."

Princess Beatrice Announces Pregnancy

Princess Beatrice announces pregnancy (Image: Getty)

Beatrice announced she was pregnant via Buckingham Palace on Tuesday. The King has been informed and both families are “delighted”, a statement read.

A statement released by Buckingham Palace read: "Her Royal Highness Princess Beatrice and Mr Edoardo Mapelli Mozzi are very pleased to announce that they are expecting their second child together in early spring; a sibling for Wolfie, aged eight, and Sienna, aged three. His Majesty The King has been informed and both families are delighted with the news."

The happy news comes during one of the royal family’s most personally challenging years, with the King, the Princess of Wales and Beatrice’s mother Sarah, Duchess of York all being diagnosed with cancer.

Sarah was treated for malignant melanoma skin cancer in January, just months after undergoing a mastectomy for breast cancer, but Beatrice said in May the Duchess had been given the “all clear”.

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