The "Mother's Daughter" singer took to social media to address a follower who tried to hit on her new boyfriend.
After Cody shared a picture from his Tiffany & Co appearance on Friday, a fan wrote, "Does Miley share?"
Miley quickly nipped that in the bud by responding with a big fat thumbs down emoji.
She also put her claim on Cody and commented "Boo thang" on his sultry photo.
Miley isn't the only one dishing on their newfound love.
The Australian 22-year-old told reporters at Friday's event that they "are very, very happy" together.
And while many think their relationship came out of left field, Cody wants everyone to know they've been friends for a long time.
“The reason why it hasn’t been a really crazy sudden thing is just because we’ve been friends for so long,” he said, explaining they “found each other again in a space where we’re both not partying, working real hard, and it just keeps things healthy and it’s good.”
There's even a photo of them circulating from 2015 when he was dating model Gigi Hadid.
Things seem to be steaming up between the two.
Miley shared a bathroom selfie cuddling up to a shirtless Cody the day she was released from the hospital following surgery after catching tonsillitis.
During her hospital stay, her new beau came to visit with flowers and his guitar in hand.
He even serenaded Miley with an adorable song he wrote just for her, which he says she's forcing him to release next week.
“She was like, ‘If you don’t put this s— out, I’m putting it out on your behalf for you. I’m getting your Spotify login and doing this s— myself,'" he told PEOPLE.
Miley's Love Life!
Cody is Miley's second relationship since her separation with Liam Hemsworth.
As The Blast reported, he filed for divorce in August less than one year after they said "I do."
Miley quickly moved on to "The Hills" star Kaitlynn Carter. They dated one-month before the singer made her relationship with Cody public.
Liam has since moved on too. He's dating 22-year-old Australian bombshell, Maddison Brown.