The Insider.com

Bruce Willis and Demi Moore's youngest daughter Tallulah Willis (pictured middle) stepped out in style on Saturday night, being joined by her sisters at Le Bal des Debutantes at the Hotel Crillon in Paris.

• November 27, 2011Kelly Osbourne: Miley Cyrus is Not a Stoner!
• November 27, 2011Celeb Doppelgangers [Pics]
• November 26, 2011Lily Allen Welcomes Baby Girl
• November 24, 2011What We're Thankful For...
• November 24, 2011The Many Wacky Faces of Robert Pattinson
• November 24, 2011Celebs Save Lives with Designer Handbags

In a picture posted to Twitter on Sunday, Tallulah is flanked on both sides by Rumer Willis (pictured left) and Scout Willis (pictured right).

While Rumer stunned in a jaw-dropping, plunging v-neck dress, Tallulah, 17, went more conservative in a sleeveless black and silver gown. Scout stood out in a red-hot scarlet dress and black sash.

This year Rumer was the only member of the Willis clan attending the event as a debutante. Scout was the last sibling honored by the ball in 2008. Bruce Willis also attended the event according to People.com, and source reportedly explained to the website how the movie star reacted, saying, "He was a little different than three years ago, more reserved. He was there for his daughter, but protective. It wasn't until around midnight when he danced with Tallulah that you saw him become more relaxed."