Los Angeles (FT)Singer Beyonce has penned an open letter to the US’ First Lady, Michelle Obama, thanking her for fostering a positive environment for black women. According to femalefirst.co.uk., in the letter whose copy is with GlobalGrind.com, Beyonce wrote Michelle is the ultimate example of a truly strong African American women. “She is a caring mother, she’s a loving wife, while at the same time, she is the First Lady,” it said.