03/17/2014 AT 10:00 AM ET
Zach Belden set up an Instagram account for his 80-year-old grandmother to help document her life as she battled cancer.
Twenty thousand followers later, Betty Simpson is an Instagram star who can count Pharrell Williams among her fans.
“He loves me so much, that’s why he did it,” Betty told ABC News of her grandson. “He doesn’t want to lose me and he’s just good to me.”
Betty said she’s “been very sick,” having nearly died twice six months ago. She and Zach have been inseparable ever since, with the younger Belden documenting his grandmother’s life in photos and video clips.
One of Simpson’s most popular posts shows her dancing to Williams’s song “Happy,” which likely prompted the Grammy-winning star to follow her.
Betty said she feels like a celebrity with each new follower. “Wouldn’t you?” she asked. Despite her fame, though, she’s focused on “just being with family” and “living minute to minute.”
See all of Betty’s Instagram pictures here.