"I've never been surer of anything in my life," she told Entertainment Tonight, adding "We just now started being serious in the past few months and it's really just changed my life in so many ways and brought so much happiness to my life. I feel so safe and he's so special. We're best friends and we're together every minute. I don't know what else I could ask for. He's perfect for me."
Paris, 36, and Chris, 31, were at the Race to Erase MS Gala at the Beverly Hilton in Los Angeles when the hotel heiress was spotted with some jewellery on her ring finger.
However the ring was a gift from a friend and Chris was quick to add that the couple were "not yet" engaged, saying "you'll find out."
Earlier this week the American businesswoman posted an Instagram snap from Beverley Hills captioned "The greatest feeling in the world is to be with someone who wants to hold you. Wants to kiss your forehead, wants to be around you all the time. Wants to text you all day. Wants to see you smile. But what’s better than that is finding someone who does it all because he wants to see you happy..."
Younger sister Nicki walked down the aisle in 2015 when she married into the aristocratic Rothschild family. Nicki and husband James welcomed their first child, daughter Lily, into the world last summer.
Hilton, who has turned her attention to the perfume industry in recent years, said that meeting her niece has made her consider having her own family.
"It's just the meaning of life to have a family of your own and bring children into the world," she said to E! News in March this year "so I cannot wait to do that one day."