Nick Carter is mourning the loss of his brother, Aaron Carter.
The Backstreet Boys member, 42, posted his heartbreak on social media Sunday, following the news Aaron died Saturday at the age of 34.
Nick posted several throwback photos of the brothers in their youth with a lengthy caption on Instagram.
"My heart has been broken today," the post began. "Even though my brother and I have had A.C.mplicated relationship, my love for him has never ever faded. I have always hel...