Bruce Willis and Demi Moore's three girls are all grown up ... and ready to make their Parisian debut!

Rumer, 23, Scout, 20 and Tallulah, 17, glammed it up at Le Bal des Debutantes in Paris. The threesome, who posted this picture on Twitter, were accompanied to the annual debutante ball by their dad, Bruce.

Of all three dresses, our vote goes to Tullulah's black and silver Lanvin gown. As for Rumer's braless number, that's one way to make an impression. When she heard it was a coming out party, guess she thought it was referring to her breasts.

High society, indeed.