Today in Tweet Beat, most are sad at the news of Jackass star Ryan Dunn's untimely death in a car crash early this morning, but a few controversially weigh in about the dangers of drinking and driving.

Last night Johnny Knoxville and Britney Spears were both guests on Jimmy Kimmel Live, where they aired a skit of Britney performing one of the stunts from Jackass 3D, "The Poo Cocktail Extreme." It doesn't appear as though they used actual poop in the bungee porta potty, like they did with Steve-O in the movie, but…

On Ceremony: "A young guy crashes the wedding of the thirty-something woman he wants back." Hm. Is the age descriptor really necessary? Well, anyhow, the premiere was good!

Knoxville explains: "[Our female friend] got hurt doing a stunt once and so we decided no more girls doing stunts. No that they can't — just in Jackass, because we all hated feeling that way."

• Nicole Richie is pissed at the paparazzi.

• As part of Operation Cheating Never Happened, Ashton Kutcher and Demi Moore spent their 5th anniversary in bed and Tweeted a snuggly photo. [NYDN, Twitter]

• Despite Judge Elden Fox's ruling yesterday that Lindsay Lohan would remain in jail until her trial on October 22, the actress has been released after posting $300,000 bail. [TMZ]

• In an interview with the German magazine Das Neue Angelina Jolie said, "I doubt that fidelity is absolutely essential for a relationship. It's worse to leave your partner and talk badly about him afterwards..."

• Robin Wright Penn has filed for divorce from Sean Penn due to "irreconcilable differences." They've already drawn up divorce papers twice before and announced their reconciliation in May.

• A smattering of guy-centric sites have decided that August 4 should be A Day Without Megan Fox: