Pippa Middleton and investment banker boyfriend, Nico Jackson, have announced their break up.

Middleton, 32, dated Jackson for three years, but the couple found it difficult when Jackson moved to Geneva this year to work for a Swiss hedge fund.

Pippa Middleton and Nico Jackson pose at the Boodles Boxing Ball in 2013. Photo: AAP

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It was reported the couple found it difficult to be apart, and were both concentrating too hard on work to find time for each other.

The couple were recently photographed together during a night out in London, paparazzi photos showing the good-looking pair seemingly smitten with each other.

But Middleton was also spotted dining with ex-boyfriend, 40-year-old investment banker, James Matthews, in recent weeks.

She dated Matthews in 2012, just before her and Jackson got together.

After graduating university, Middleton worked briefly in public relations, before working for her parents’ party decorations company.

She received an $800,000 advance from Penguin for a book on party planning, published in 2012.

Middleton is currently retraining to be a nutritionist, and continues to take part in extreme sport events such as the Otillo Race in Sweden, which entails 75 kilometres of running over rough terrain and swimming through the choppy Baltic sea.