At a rowdy 18 year old’s birthday party, you might expect the restaurant or the ladies bathroom to get trashed, but not the birthday girl’s 15 year old sister.

The Moore – Kutcher – Willis clan got together this past Friday night to celebrate Scout Willis’ 18th birthday with a 20’s flapper-style bash at L.A. restaurant Cicada. Guests included Dita Von Teese, Marisa Tomei, and Rumer Willis, doing her best to let everyone know exactly what kind of underwear she was wearing.

But the real star of the night was the youngest Willis girl, Tallulah Belle, who spent the night smoking, drinking, and hitting on older men. She reportedly ended the night by stumbling out of the restaurant with a pack of cigarettes and a pack of her friends, who attempted to keep her upright on her walk of shame to a waiting vehicle. Step dad of the year, Ashton Kutcher, looked none to happy about it either.

Now, to be honest, the drink the paps have circled in the above picture looks like nothing more than ice water– which may be damning enough evidence in itself, since no one drinks ice water at a party unless they’ve already gone overboard with the alcohol. If you’re going strictly non-alcoholic, you’ll have either soda, or juice, or a Redbull in your glass.

She’s also shoeless– another likely sign of inebriation– and in the pictures of her leaving the restaurant, she is quite clearly carrying a pack of cigarettes.

We get more of Rumer than we can take, and a decent dose of Tallulah, but it’s ever so rare that we see middle daughter Scout Willis photographed with her mom, Demi Moore. Scout’s almost 18 now, and she accompanied her mother (and their two hottie bodyguards!) for a walk around Nice.

I’m sorry, but these Willis girls are just proof that when beautiful people mate, the offspring are not always all that beautiful. Unless those two people are Brad and Angelina. In which case the babies are guaranteed to be beautiful. Really all babies anywhere just need to be touched by Angelina and they’re guaranteed to be beautiful. Demi Moore? Not so much. I have these internal debates as to whether it was Demi’s genetics or Bruce’s that caused all the facial problems with these girls. Seriously I dedicate minutes of my life to pondering this. That’s just how unexciting my sex life is.

But it would have to be Bruce, right?

Thoughts?

Britney leaves Promises to attend an AA meeting in Santa Monica. And Perez wins this link by being the only blogger with the sense to clip the other people out of the pic. [Perez Hilton]

The Associated Press has revoked Paris Hilton’s media privileges. [The Blemish]

Hide your crack; Bobby Brown’s out of jail. [Celebrity Smack]

Nicole Richie is not engaged to Joel Madden, people — she’s wearing a ring because we haven’t been writing enough about her lately. Sorry, Nicole. Our bad. We won’t let it happen again. [POTP]

If Rumer Willis wasn’t enough for you, her fifteen-year-old sister, Scout, is now officially drinking age. [dlisted]

Nick Cannon’s not married, just totally pussy-whipped. [Glitterati]

Jessica Simpson on the set of her aptly named film, Blonde Ambition. [A Socialite's Life]

I completely forgot that ANTM premiered this week, so thank goodness someone thought to recap it. [IBBB]