In the snap, the "Wrecking Ball" hitmaker is seen flaunting her cleavage in an unbuttoned shirt, reports dailymail.co.uk.
Kaitlynn, also a blogger, commented "Dear God" on the picture.
Reacting to the blogger's comment, many fans termed Miley and Kaitlynn as "power couple".
One user wrote: "Please treat Miley good. You make her very happy."
Another user wrote: "You are so lucky that you have got Miley as your love."
Miley and Liam Hemsworth announced their separation on August 10 this year. The news came hours before photographs surfaced of Miley making out with Kaitlynn in Italy.