"Selena Gomez and Ke$ha both are young and have big hearts."
Selenium deficiency causes Keshan disease which is cardiomyopathy in young children. Also, singers like to dye their hair (Loss of hair pigment is seen in Selenium deficiency aka Keshan disease).
Submitted by Krutika.
Interesting fact: Keshans disease is thought to be caused by Selenium deficiency and coxsackie virus. It's common in places where selenium content in soil is low (China).
Thanks Krutika for the mnemonic =)