Hilton wrote: "I have never felt so happy, safe and loved". He's my everything. I'm so happy and excited to have someone who is my best friend, who I trust. She's done little to hide her love for him on her social media pages, and recently posted a picture of them kissing alongside the caption: "One day, someone will walk into your life & make you see why it never worked out with anyone else".
"I was so excited and surprised". I feel like the luckiest girl in the world!
Whilst Chris added: "Paris is the most attractive and incredible woman both inside and out".
Zylka, 32, whose acting credits include 90210 and The Amazing Spider-Man, proposed marriage to the hotel fortune scion during New Year's skiing holiday in Aspen, Colorado.
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"Ever since our first date I knew there was something special about him", she said.
Zylka, who starred in United States drama The Leftovers, first met Hilton eight years ago.
Hilton also gushed about her enormous engagement ring to the magazine: "The ring was so gorgeous and sparkling. Thank you for showing me that fairytales do exist". I was shaking as I put it on.
Hilton shared the news via Twitter, calling Zylka the "love of (her) life" and "best friend". I feel like the luckiest girl in the world!
Chris and Paris have been dating just shy of a year now.