Diddy, 49, posted a photo of Kim pretending to hold the sun with her hands.
"@ladykp I MISS YOU," he captioned the snap next to a black heart emoji.
"When you miss them that’s when they are right by your side," one fan wrote in the comments section.
Kim died at the age of 47 on November 15, 2018, after a battle with pneumonia.
Mary J. Blige and many other celebs attended Kim's funeral days later in her hometown of Columbus, Georgia.
Diddy and Kim had three children together during their on again, off again relationship: son Christian and twin daughters D'Lila and Jessie.
Other high-profile girlfriends that the hip-hop icon has had included Cassie, Jennifer Lopez and most recently Lori Harvey.