The 20-year-old, who was rumoured to have wed "The Hunger Games" star over Christmas and was spotted wearing matching wedding rings earlier this month, called the 23-year-old actor her "hubby" in an interview to Cosmopolitan magazine.
"I'll literally look at him and be like 'You are hot, dear god!' The other day, I turned on the pool heater and it was steaming, and he walked outside and took off his clothes and jumped in the pool.
"I was like, 'I'm gonna faint - the hottest guy of my life is in a steaming pool. This looks like a Playgirl shoot.' So I took a photo and made it the background on my phone. My best friend grabbed my phone and was like, 'Who's that? He is so hot!' [and I replied] 'That's my hubby!" said Cyrus.
She also said that their relationship is the main source of happiness.
"Number one is my relationship with Liam. That's what I feel the most confident in because you never know."