Who's Madge groping?Madonna's getting her fingerless gloves round a serious piece of ass.

The Material Girl is copping a booty feel at the Met Ball last week.

And Madge's busy fingers have been exposed today, thanks to the power of Twitter.

The model owner of this delicious derriere has used the social networking site to expose the queen of pop's rear-handlingMadonna, Kanye West and Amber Rose .

So who is the owner of the butt Madge couldn't not touch?

It's Kanye West's model girlfriend, Amber Rose.

And as the snap shows, (right) the rapper seems to be enjoying Madge's appreciation.

However, Kanye may not be so pleased that his other half has exposed the pics to the world via the Twitter medium.

Kanye yesterday blogged calmly: "I DON'T HAVE A F*****G TWITTER."

He ranted: "Why would I use Twitter?

"I only blog five percent of what I'm up to in the first place. I'm actually slow delivering content because I'm too busy, actually busy being creative, most of the time – and if I'm not and I'm just laying on a beach I wouldn't tell the world."

Could this be a future bone of contention in the Kanye-Rose union?