Paris Hilton and River Viiperi partying at the Gotha Club during The 66th Annual Cannes Film Festival on May 16, 2013. Credit: FAMEFLYNET PICTURES

Paris Hilton can't get enough of River Viiperi, as fellow clubgoers witnessed firsthand when the 32-year-old socialite and the 21-year-old model engaged in a steamy makeout session during a Cannes Film Festival party at Gotha Club on Thursday, May 16.

The couple celebrated their one-year anniversary by partying with models Cara Delevingne, Georgia May Jagger and Josh Mclellan. "Such beautiful people, both inside and out," Hilton wrote in an Instagram caption.

Ibiza-born hunk Viiperi shared a picture of his reality star love via Instagram May 18. "Happy one-year anniversary to the gorgeous, beautiful, perfect, most amazing and most caring girl on this planet," he wrote in the caption. He then referred to Hilton as "my girlfriend, my future wife, my life."

"I've never been happier. This is a good guy," Hilton said of Viiperi on The Late Show With David Letterman May 2. "He's so hot."

That same day on The Wendy Williams Show, the former Simple Life star said she was hoping to settle down and start a family with Viiperi. "I think that's the meaning of life to have children and have a family one day," she explained. "I am so in love. I feel so lucky to have met him. He's one of the kindest, most loyal men I've ever met in my entire life, and he treats me like a princess."