Princess Diana filmed herself singing "All I Ask of You" from "Phantom of the Opera" as a wedding anniversary gift to Prince Charles in "The Crown." The private performance is said to have actually happened in real life, although there is debate whether the real Diana actually sang the song or mimed.

Can Diana actually sing?

Princess Diana really did film herself performing “All I Ask of You” from Phantom of the Opera, and shot the video on the musical's West End set. ... “That it's exactly as it happened in the series—as in she hired the West End set, got a film crew in, and filmed it for Charles.

Did Diana really sing Phantom of the Opera?

The Phantom of the Opera also confirmed that Princess Diana performed 'All I Ask of You' on the Phantom stage for a 'private video. ' However, the official page for the Andrew Lloyd-Webber production also failed to specify whether this was a dance performance or whether the Princess sang the song on stage.