Why the feminine "la" in "à la Leonardo DiCaprio", though he is a man?

Question

I just saw this sentence I can't understand in other user's thread.

"Il a des jolis yeux bleus à tomber par terre, un peu à la Leonardo DiCaprio."

What does this phrase mean, and why is the feminine "la" used, not the masculine "le", even though Leonardo DiCaprio is a man? At least, the last time I checked, he was. Does Michael Jackson have to be feminine, too, "à la Michael Jackson"?

Answer 1

I would imagine à la is short for à la manière de.