The Since U Been Gone hitmaker is following in the footsteps of Taylor Swift and designing a line with American Greetings, and the cards will feature cartoon characters, glitter, and quirky messages, and two versions will play Clarkson singing Happy Birthday when opened.

She says, "I am so excited to share a new line of greeting cards that I created with American Greetings! We designed them with all of my fans in mind: it's a little of my voice and personality, but the real point is to share sweet experiences and important times in your life with your friends and family."

The line will be sold in U.S. Walmart stores from this month (Apr15).