London posted an emotional tribute Sunday on Instagram:
"One of the reasons I fell in love with you … your paternity
Today we celebrate you
I love you Ermias "
The post included a picture of her, Nipsey and their son together.
She posted the same picture on her Instagram story with the caption: "Happy Father's Day to the Big."
London, model and actress, and Nipsey had been together for five years at the time of her death.
Besides their son, Kross, they also formed a close-knit family with Hussle's daughter from a previous relationship and London's son, Cameron Carter, of rapper Lil Wayne.