Post Malone paid tribute to late rapper Mac Miller at KAABOO Del Mar Festival in San Diego this weekend, wearing an airbrushed t-shirt that read "R.I.P. Mac Miller." He shared a photo of himself wearing the tee on Instagram, designed by LA artist Isa Beniston. Check it out below.

In early August, Mac Miller hinted at an upcoming collaboration with Post Malone, telling Rolling Stone, “Me and Post have been talking about doing an album, so we got together.”

After Miller's tragic death on Friday, September 7, Post Malone shared his condolences via Twitter, writing, "God fucking dammit. 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 fucking love you mac."

In other music news, ScHoolboy Q is delaying the release of his upcoming album due to Mac Miller's passing.