Olivia Newton-John's daughter Chloe Lattanzi and various celebrities paid their tributes to the "Xanadu" singer who died at age 73 on Monday at her home in southern California.

Lattanzi took to Instagram to honor her mother and posted a series of photos showing her and the singer sharing some happy moments. It included a photo of a young Lattanzi kissing her mother on the lips and a smiling photo of Newton-John holding her daughter while on the beach. Lattanzi did not caption her photos.

Lattanzi stayed close to her mother throughout the latter's battle with breast cancer. As the singer's only child, the pair shared a special relationship with each other. Three days before the singer's demise, her daughter shared a photo of them posing happily in an open field. The "Grease" actress' daughter captioned the post, "I worship this woman. My mother. My best friend."

Newton-John's "Grease" co-star and longtime friend John Travolta uploaded an old photo of the singer on Instagram and wrote, "My dearest Olivia, you made all of our lives so much better. Your impact was incredible. I love you so much. We will see you down the road and we will all be together again. Yours from the first moment I saw you and forever! Your Danny, your John!"

Kelly Ripa wrote on Newton-John's official Instagram page, "what a loss. RIP to the loveliest lady."

Singer and songwriter Richard Marx penned a tribute to his friend: "My heart is broken. Rest now, sweet friend. You were as kind and loving a person as there's ever been. I'll miss you every day."

Dionne Warwick also tweeted, "Another angelic voice has been added to the Heavenly Choir. Not only was Olivia a dear friend, but one of the nicest people I had the pleasure of recording and performing with."

Marlee Matlin recalled a sweet moment with Newton-John and said, "I am SO saddened at the news of the passing of Olivia Newton John. I remember being so star struck when I met her at my first Hollywood gathering for Paramount. She was the sweetest and brightest light and I loved getting to know her on 'It's My Party.' RIP dear, sweet Olivia."

Fans also flocked to Lattanzi's Instagram post and sent their condolences to the pop star's family.