I know I am very selfconcious about my body. And yes I do worry about what I look like during a dance even if the lady is the one that grands the beauty to our performance. As good as I may be able to make her look, I myself do want to be the dashing young man dancing with the gorgeous lady and not the looser that gorgeous lady is wasted on ;)
To do my job, aid the lady in looking good, I feel the need to do my lead as perfect as I can. That means I must not worry about little details like my posture etc - therefor I will worry about that during practice where noone else is watching. But not necesserily out of narcissism, but because only once I am happy with myself do I feel I can give the lady everything she requires.
Basically I think I just repeated what anonymous said above ... but I too am a leo and therefor love the sound of my voice and the sight of my type (as you all should

)
I walked into the studio once and there was a pro couple (two of the instructors) practicing their routines. I opened the door walked in, waved to them and I had just turned to check the schedule for the group lessons to see when I should come in that week, when I heard her shout at him:
"Can I have some eye contact!? Stop looking at yourself and start looking at me!"