"I am completely lost," London, 34, captioned an Instagram tribute to her longtime love. "I've lost my best friend, my sanctuary, my protector, my soul."
Sharing a series of beautiful photos of the two and their kids, she added: "We are lost without you babe — I have no words."
London and Hussle, 33, were in a relationship since 2013 and shared one child, 2-year-old son Kross. In her Instagram post, London shared a photo of their baby's face for the first time.
The actress is also a mother to son Cameron Carter with rapper Lil Wayne and Hussle was a father to daughter Emani Asghedom from a previous relationship.
London's emotional message came moments after Los Angeles Police arrested Hussle's alleged killer, Eric Holder.
In a news conference this Tuesday, April 2, LAPD chief Michel R. Moore said Hussle and Holder had a verbal dispute outside the rapper's Los Angeles clothing store on Sunday afternoon. Later that day, Holder was caught on surveillance cameras returning to the scene with a handgun and shooting down Hussle. He also shot two men who were standing next to the rapper, before jumping into a nearby car.
A vigil for Hussle was held at the scene of the crime the following day, but chaos erupted when attendees reportedly heard gunshots.