Beyonce writes public thank you to Michelle Obama

(CBS News) In a handwritten note posted on her website, Beyonce sent a very public "thank you" to first lady Michelle Obama this week.

The Grammy winner praised Mrs. Obama in the letter as "the ultimate example of a truly strong African American woman."

Pictures: Beyonce
Pictures: Michelle Obama

"She is a caring mother, she's a loving wife, while at the same time, she is the FIRST LADY!!!!" Beyonce wrote. "No matter the pressure, and the stress of being under the microscope - she's humble, loving and sincere. She builds and nurtures her family while also looking out for so many millions in so many ways."

The singer, 30, also thanked the first lady for being a role model for her daughter, Blue Ivy Carter, who was born in January.

"I am proud to have my daughter grow up in a world where she has people like you, to look up to," she said. "Love, Beyonce."