Lady Judy Martin passed away on Sunday - seven years after her husband died in 2016.
The couple married in June 1966
Tributes have flooded in for the former Abbey Road secretary.
The Liverpool Beatles Museum said: "Very sad news to hear of the passing of Lady Judy Martin. Reunited with George.
"Our thoughts and prayers our with the Martin family. May she RIP."
Lady Judy married Sir George - known as the fifth Beatle - the year he signed the group.
Source: Holly Christodoulou/thesun.co.uk