At least that's what Tina Brown's Newsweek thinks in a front-page lead article that imagines what the late Princess would be doing at 50.
The piece hits newsstands days before July 1, which would have been Diana's milestone birthday.
Newsweek even mocked up an image of an older Diana and her new daughter-in-law Kate for the cover
And the cover features a superimposed image of the Princess which has been digitally aged, walking next to her new daughter-in-law, Kate, the Duchess of Cambridge.
The picture shows Prince William's wife giving her mother-in-law, who is still trim with barely a few wrinkles, an admiring glance.
The article - entitled Diana at 50 - is written by British journalist Tina Brown, editor-in-chief of Newsweek.
In the piece Brown also imagines Diana would be living in New York, after having married two more times.
'There is no doubt she would have kept her chin taut with strategic Botox shots and her bare arms buff from the gym,' she writes.
Brown - who wrote the book The Diana Chronicles - says the mother-of-two would have a good relationship with ex-husband Prince Charles and be BFF (best friends forever) with Carole Middleton, William's mother-in-law.
She says: 'I believe her best male friend in later years would have been, poignantly, her reviled first husband."