Rumer Willis has been left heartbroken after the death of her beloved friend, artist Ilona Royce Smithkin.The 32-year-old daughter of Demi Moore and Bruce Willis took to her Instagram Stories on Monday to pen a sweet tribute to her late friend, who died on Sunday aged 101.RELATED: Riley Keough inundated with prayers and support following family deathSharing a photo of Ilona, Rumer wrote: "I love you sweet friend. Rest peacefully.