Kim Kardashian and Kris Humphries are engaged

(CBS) Kim Kardashian is ready to make it official with her boyfriend, New Jersey Nets forward Kris Humphries. The couple of six months are engaged.

Humphries, 26, proposed last Wednesday at her Beverly Hills home with "Will you marry me?" written in red rose petals and a 20.5-carat Lorraine Schwartz diamond ring, Kardashian, 30, tells People magazine.

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"I didn't expect this at all," Kardashian said. "I was in such shock. I never thought it would happen at home, and I never thought now."

The couple later celebrated with an intimate engagement party that was help planned by Kardashian's mom, Kris Jenner.

"Kris [Humphries] really didn't want a big celebration, but he had jokingly told my mom he'd be fine if there were mini-horses there," Kardashian says. "Later that night at the party, my mom brought out two mini-horses, covered in glitter, for us! It was hysterical!"