How to add "logged in as ...." to all the pages?

I can detect if a user is logged in or not by

$lite = Am_Lite::getInstance();
if($lite->isLoggedIn()){
....}

My question is how can I add a text "logged in as johndoe@example.com" to any page on the site.

if the above code works have you tried inserting between the {} brackets

echo 'Is logged in as '.Am_Lite::getInstance()->getUsername() ;

Is the line of code in your post correct? I thought it should be:
if(Am_Lite::getInstance()->isLoggedIn()){...}

this would make your required code something like-

if(Am_Lite::getInstance()->isLoggedIn()){
echo 'Is logged in as '. Am_Lite::getInstance()->getUsername() ;
}

but haven't tried it. I will include some 'if logged in' code in my own site but haven't gotten around to it yet so haven't tried the above yet.

i just used $lite variable, basically the code is the same.
getEmail() instead of getUsername().
The problem is solved it works.
Thanks