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Oprah Winfrey's decision to promote Meghan Markle's new range of vegan coffee to her 19.2million Instagram followers was worth at least $1million and is probably the most valuable piece of free publicity in history, experts told MailOnline today.

PR guru Mark Borkowski told MailOnline the $28-per-pack oat-milk ‘superlattes' are the first ‘baby steps’ towards Meghan and Harry building a billion dollar brand for themselves in the US. 

Ms Markle's coffee investment is the first since she and Harry emigrated to pursue a private life and seek 'financial independence' from the royal family in California - but is still likely to 'raise eyebrows' at the palace, experts claim.