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Oatly, the plant-based and vegan milk brand, says it's raised $200 million from investors including celebrities Oprah Winfrey, Natalie Portman, and Jay-Z's entertainment company.

The new investors, which also include former Starbucks CEO Howard Schultz, were led by the multinational Blackstone Group.

They'll join Oatly's existing partners and its founders - brothers Rickard and Björn Öste - who will also reinvest with additional capital.

The fast growing plant-based food sector has gained investors' attention in recent years, especially as fast-food chains and upscale restaurants alike create menus to attract both health- and environment-conscious diners.

The Oatly company is based in Sweden, but has tie-ups with several cafes in the United States, including Starbucks, to make plant-based coffee and tea, and also sells its products online and in retail stores in several countries.

Much of the demand for plant-based food is being led by millennials and generation Z consumers.

Oatly said the proceeds from the latest investment will be used to fund its expansion projects in current markets, and to set up new production plants and create jobs in Europe, the United States and Asia.