Two days after the singer and new mom, 30, wrote a heartfelt and handwritten thank you letter on her official website, the President's wife, 48, responded via Twitter Friday. "Thank you for the beautiful letter and for being a role model who kids everywhere can look up to," Obama told Knowles.

In her letter, Knowles praised Obama for being "the ultimate example of a truly strong African American woman."

The 16-time Grammy Award winner continued: "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."

"Michelle, thank you so much for every single that you do for us. I am proud of have my daughter [Blue Ivy, 3 months] grow up in a world where she has people like you to look up to."

Knowles has been a longtime supporter of the Obama family, as she performed Etta James' "At Last" during the 2008 inaugural ball. In 2011, she teamed up with the First Lady as part of Obama's Let's Move campaign.

Source