This is what works for me, but it might not necessarily work for everyone. I stand in front of a mirror in nothing but a smile and tell myself I am a beautiful woman. I say it over and over and over until I feel it in every fiber of my being and my reflection looks increasing beautiful every time I say it. I do that if I need a boost, or if I'm feeling particularly ugly at the time.
I hope you all find the beauty about yourself that you deserve to feel.