Diagnosed with breast cancer in 2009, when she was 23, she became an activist for raising awareness about the disease among young people and founded the charity CoppaFeel!.

[1][2][3] Her parents divorced when she was nine, and her mother returned to England with Hallenga and her two sisters, where they lived in Daventry, Northamptonshire.

[5] Hallenga was profiled in Kris: Dying to Live, a documentary that covered her experience with terminal breast cancer.

[6][7] In November 2014, Hallenga was featured as a special guest on Russell Howard's Good News where she talked about her charity and experiences.

I thought it was never going to happen to me.Hallenga and her twin sister Maren decided to devote themselves to educating young people about breast cancer.