Rainy Day Diva was created as a positive space to discuss beauty and fashion - minus the implied expectation of perfection. You don't have to live a charmed life to live a fabulous life!
Rainy day - The unexpected challenges that life brings; a period of want or need.
Diva - A glamorous and successful female performer or personality; leading lady.
That means, you, since you are the leading lady in your life.