01/05/2010 AT 3:15 PM ET
Casey Johnson’s closest friends are flooding Twitter with notes of grief following the Johnson & Johnson heiress’s death on Monday at age 30.
“R.I.P my Angel,” Johnson’s fiancée, the reality star Tila Tequila, wrote Monday. “u will forever be in my heart! I love u so so much and we will Marry when I see U in Heaven my Wifey.”
She later added: “I can’t stop these haunting visions of her and I. We made such a lovely couple, only beginning to spend the rest of our lives together ”
The Hilton sisters, who were close friends of Johnson’s, also mourned publicly.
Nicky Hilton, who was the godmother to Johnson’s adopted daughter Ava, wrote: “Rest in peace Casey Johnson. I love and miss you so much. You are my best friend, my sister…I am broken without you.”
Lohan added: “r.I.p. To a friend to and of many- Casey Johnson- my regards to her family, friends and her beautiful daughter Ava* you are in our hearts CJ.”