[jQuery] append and slowly show new content in DOM

Hi,
I'm guessing this is an easy question, but I can't figure it out.
I want to add some new content to the DOM, so I have a line like this.
$('#div_container').append('

hi there!

');
However, I'd like it to slowly appear via show().
But adding show() doesn't work as I'd expect. The new content appears instantly.
$('#div_container').append('