Amy Winehouse Puts On a Show!

Not of the musical variety either.

The troubled singer put on a special performance during visiting hours at Pentonville prison - current residence of Blake Fielder-Civil - on Thursday, reports celebrity gossip newspaper The Sun (UK) yesterday.

According to The Sun, Amy Winehouse pulled up her top, pressed her bare breasts against the glass booth separating her and Blake, and started shaking it like ... well, we don't know what that would be like.

MARITAL BLISS: Despite Blake Fielder-Civil's "affair of the heart" (or something like that) with Melissa Goldstone, Amy Winehouse paid him a sexy visit Thursday.

The other visitors at the prison were apparently shocked and disgusted (really, we can't imagine why that would be the case), with one even saying: "It was not a pleasant sight. Amy was completely out of it."

That would distinguish this from any other day how?