A hidden Cupid in one of Vermeer’s most famous paintings?

Say whaaaaat?

From Artsy:

Johannes Vermeer’s Girl Reading a Letter at an Open Window (1657–59) was recently undergoing restoration when conservators made a groundbreaking revelation. Forty years ago, X-rays had discovered an earlier version of the painting was dominated by a large image of Cupid that comes in the form of a painting within the painting. It was assumed that Vermeer himself had painted over the figure before the work was finished.

Read the whole fascinating article here...