Madonna and Spears use to be buddy-buddy but not anymore because Britney wasn't interested in converting to the Kabbalah religion. Madonna has chosen another pupil to brain wash, Lindsay Lohan.

Lohan estatic to be buddy-buddy with Madonna, that Lindsay has gone as far as checking out the Kabbalah faith. Madonna and Lohan are such good friends that they're planning to do a duet.
Source: msnbc