Hilton made the reveal that she'll be using both names while chatting up a photog in Beverly Hills Thursday.
Zylka popped the question with a sizable rock earlier this month during a weekend ski trip in Aspen. She made the big announcement on Twitter, writing “I am so excited to be engaged to the love of my life and my best friend ... I have never felt so happy, safe and loved. He is perfect for me in every way and showed me that fairytales really do exist!”
The future Mrs. Hilton-Zylka (or Zylka-Hilton) had been dating Zylka for nearly two years.