Madonna reveals she has been 'checking in' on Britney Spears amid conservatorship battle

Filmmakers Behind ‘Framing Britney Spears’ — Which Pop Star Criticized — Prep Follow-Up Doc

'Framing Britney Spears' Follow-Up Documentary 'Controlling Britney Spears' Is Coming Tonight

Madonna Says She Just Had a Phone Call With Britney Spears After Her Engagement