"Kate had only just given birth to Prince Louis and was feeling quite emotional - though just what upset her is unclear", a source explained to veteran royals reporter Camilla Tominey of The Telegraph, according to People, which confirmed separately that the pre-wedding incident did happen.
But those clamouring to get to the bottom of this royal feud may have missed the big clue that's been right under our noses all year.
During her appearance, Meghan discussed the importance of higher education.
Until now, the Sussexes have lived in Nottingham Cottage - a two-bedroom house in the grounds of Kensington Palace, where the Cambridges also live.More news: Company recalls infant Ibuprofen sold at Walmart, CVS
William then steps in laughing and clarifies that yes, they do see certain topics differently but according to Harry, these are "healthy" disagreements.
Harry then shed further light on his pragmatic attitude toward tensions in the family, admitting that spending so much time together could be challenging.
And now you know.
" ... Working with family, of course it has its challenges ..."
Michelle Obama and Meghan, Duchess of Sussex met in London during a stop on the former United States first lady's book tour for her new memoir Becoming, according to reports in the Evening Standard and Harper's Bazaar.
"Like me, Meghan probably never dreamt that she'd have a life like this, and the pressure you feel - from yourself and from others - can sometimes feel like a lot", she said.