Photo: Gary Miller/FilmMagic

Post Maloneis keepingMac Millerclose to his heart.
The“Rockstar”rapper, 23, found a fashion-forward way to honor Miller, whodied on Sept. 7at age 26, on Friday.
When Malone took the stage at theKAABOO Del Mar festivalnorth of San Diego, he wore a shirt adorned with pink, blue and orange flowers that read “RIP Mac Miller,” and his pants were decorated with hearts.
His tribute moved fellow musicians onInstagram.G-Eazycommented with a red heart andBillie Joe Armstrongwrote, “Be kind to yourself.”
Post Malone/Instagram

A source told PEOPLE that Miller went into cardiac arrest after an apparent drug overdose. The official cause of deathis yet to be determined.
RELATED VIDEO: LISTEN: Mac Miller Was Working on Music Hours Before His Death
Carl Timpone/BFA/REX/Shutterstock

Malone is one ofmany celebrities mourning Miller. “God f—ing dammit,” Malone posted onTwitterafter Miller’s death. “You were such an incredible person. You changed so many lives. Had so much love in your heart. You inspired me throughout highschool, and I wouldn’t be where I was today without you. Never a more kind and sincere and beautiful person. I f—ing love you mac.”
He added, “We’ll make that album one day bubba. Miss you so much.”
In an AugustRolling Stonearticle, Miller talked about his plans to collaborate with Malone. “Me and Post have been talking about doing an album,” he said.
The friends recently had a jam session withThundercatand Frank Dukes. “It was beautiful,” Miller continued. “We were just having a great time.”
source: people.com