The interruption at the newly-opened Godmothers store in Santa Barbara was captured by journalist Elizabeth Holmes as Meghan, 43, reflected on the safety she felt in bookshops.
Oprah came in so quietly that I didn't even realise, I am sat there studiously filming and then all of a sudden it's like Oprah right there.
The awkward interaction comes ahead of Prince Harry's 40th birthday celebration, which will also take place in California, where he lives with his family.
When you're listening to one VIP and another walks in... the video was captioned.
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