[caption id="attachment_87879" align="aligncenter" width="607"]  Photo: Getty Images[/caption]

Amanda Bynes has quickly supplanted Lindsay Lohan as the nutbox to watch. In the past week she's supposedly chucked a bong out her apartment window, gotten arrested, and told Rihanna that Chris Brown "beat you because you’re not pretty enough.”

Now she's turned her spite on former NSync member Lance Bass, tweeting that he's an “ugly ex boy band member with no talent or career."

Ugly?!?

The What I Like About You actress lashed out because Bass allegedly claimed she was suffering from "mental illness.”  Geez, Lance—what could possibly make you say that?

Bynes also claimed she hadn't seen Bass in 11 years, and that his supposed accusations make her "crazy."

Oh that's why you think she has mental issues.

The ever-diplomatic Bass wondered if it was even the real Bynes who was tweeting—mainly because they had seen each other several times in the last few years together, including during the filming of LoveWrecked in 2005.

To be fair we all kind of forgot about that one.