Pink is pregnant and sounding off on Twitter to prove she's still relevant as the music industry's bad girl.

Just hours after Christina Aguilera's arrest for public intoxication, the 31-year-old rocker tweeted, "Out of Myself, Britney and Christina – didn't everyone think I was gonna be the troublemaker? LOOK MA!!! NO CUFFS!"

Aguilera and her boyfriend Matthew Rutler were arrested this morning in West Hollywood ... Aguilera for public intoxication and Rutler for DUI. Pink collaborated with Xtina back in 2001 for the remake of "Lady Marmalade."

Find out when Pink last worked with Britney Spears ... after the jump.