That’s right folks, Britney Spears joined Madonna onstage for her San Diego tour stop to sing “Human Nature.” We’ve got videos of screaming folks and Britney actually looking like the sane one onstage. But it’s hard not to look sane next to Madonna’s Mad Hatter dress.

Oops, we didn’t know we couldn’t talk about sex…

Britney enters at 2:15…yeah, we timed it.

Closer look: