The image marked Ariana's first public response to his passing, and came hours after she disabled the ability for followers to comment on her posts, having been inundated with hurtful messages from his upset fans.
According to TMZ, Mac died from an overdose at his home in California's San Fernando Valley.
Early reports suggested Miller had died from a suspected drug overdose, and tributes quickly poured in from his friends, fans, and hip-hop peers after the news hit headlines.
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Nike is one of the world's largest sports apparel companies, with $34.5 billion in revenue previous year . Why Nike would do a deal with Kaepernick is "the million dollar question", she said.
"This is one of my best friends in the whole world and favorite people on the planet, Malcolm McCormick", the 25-year-old "Sweetener" singer said with a snap of the pair holding hands.
Grande and Miller's love story began back in 2013 when they collaborated on her single "The Way".
Ariana has yet to publicly comment on Mac's death but the two were extremely close for the two years that they were together so it must be affecting her quite a bit. In one post he wrote, "This was a good man with a great heart".
The artist, who just a month ago released his fifth album whose new maturity and introspection won him once-elusive critical acclaim, was found unresponsive at his Los Angeles home by emergency personnel who pronounced him dead, the coroner's office said.
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Toxicology tests have been requested, but Mac's official cause of death can not be confirmed until they come back.
Miller has been open in the past about his battles with substance addiction. There was no evidence of drug use.
"Of course I didn't share how hard or scary it was while it was happening, but it was", she said. Among them: Wiz Khalifa, G-Eazy and Chance the Rapper.
He talked about his quest for sobriety in a 2016 Vogue profile, saying, "I'm just changing how I live life, my state of mind..."
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Her message was simple: "Rest easy, insane kid".