The 33-year-old beauty was among the many famous faces who surprised the comedian and bid farewell to the late-night host after a wildly successful 22-year run on The Tonight Show.
And today, the Keeping Up with the Kardashians star is still paying tribute to her pal, sharing a pic-framed photo of six of her previous appearances on Leno, including her most recent, where she dished on her headline-making selfie in which she flashed some serious side-boob and major booty.
"#FBF a few Jay Leno appearances," the E! star captioned the cute pic.
Kanye West's fiancée was among those who surprised Leno on Thursday night with a special rendition of the Sound of Music classic "So Long, Farewell," led by Billy Crystal and accompanied by dancers in lederhosen costume.
"So long, farewell, tonight I told my folks," Kim sang, "and now, I won't be the butt of Leno's jo-okes."
North West's mama isn't the only celeb who's taken to Twitter today to share her sweet memories with Leno over the years. Michelle Obama, Britney Spears and Justin Timberlake are among the many stars who posted heartfelt goodbyes to the beloved late night icon.
Good luck, Jimmy Fallon! You've got some big shoes to fill. The final episode of Late Night With Jimmy Fallon airs tonight, and tune in to see Fallon as he takes over The Tonight Show starting Feb. 17.
And don't miss a new episode of Keeping Up With the Kardashians this Sunday at 9 p.m., only on E!