What fashion flourish is shared by Justin Bieber, Fidel Castro, Princess Diana and Drake?

If you guessed “double-wristing,” the totally gratuitous but weirdly enduring practice of wearing two wristwatches at once, you’re possibly guilty of the extraneous practice yourself.

The head-scratching look, once favored by Hollywood’s horological two-timers like Marlon Brando and Johnny Depp, has become picked up by a new generation of celebrities looking to double down on bling. It also appeals to techie watch aficionados who sport Apple watches but can’t quit their Rolexes.

Chris Pratt appeared on “Jimmy Kimmel Live!” last March to promote “The Kid,” a gunslinging Western film, wearing a brawny and elegant Cartier watch on each wrist — an action hero fashion gesture equivalent to flexing both biceps at once.