Ashlee Simpson

"I should've said, 'No, I will not go on. I will not do this,'" the singer later admitted.

Ashlee Simpson refused to wear a purity ring like her older sister Jessica.

This makes us wanna la la...

Find out how Kate Winslet was affected by Ashlee Simpson's infamous performance.

Because breaking up is hard to do.

Ashlee and Evan's family is expanding!

Say hello to Hollywood's young celebrity parents.

Find out the truth behind these infamous celebrity lies.

From Kanye West to Courtney Love, check out 25 of the craziest onstage celebrity meltdowns over the years.

Ashlee Simpson is just one of many stars who bungled sets on TV's most coveted stage.