Kicking off her birthday celebrations early, the newly 25-year-old singer posted a picture of herself cradling her stomach, captioning she had a '#VeganTurkeyBaby.'
Celebrating the day with fiancee Liam Hemsworth, Miley posed for the camera in a loose grey T-shirt, behind large silver balloons that read 'Miley.'
Miley captioned the snap, 'So close to b-day time! Stoked for a day full of Tofurkey & loved ones! Ain't it ironic? #VeganTurkeyBaby'
Her choice of wording, as well as the placement of her hand, sent fans crazy!
One fan wrote, 'There's clearly a bump'; 'Come on! That belly can't be from the thought of eating turkey for Thanksgiving!!! That's pregnant belly!', with another adding 'Are you pregnant? Hppy bdy'; 'Mikey boo whats that poking out right there lol #guessingames #pregnancy announcements.'
Miley and Liam first fell in love on the set of their popular film The Last Song in 2009. After three years of dating the couple announced their engagement in June 2012, before splitting for good in September 2013.
The couple then reconciled in early 2016 and became re-engaged a few months later.
Miley has since responded to the social media frenzy, posting a screen grab of Daily Mail's story.
She captioned, 'RUDE!!! Not pregnant just eating a s*** ton of tofurkey'.