Miley’s sister, Brandi also took to social media to send Kaitlynn a sweet message – posting a picture of the three of them alongside the caption: “Happy Birthday Kaitlynn.”
The unlikely pair’s relationship appears to be progressing at a rapid rate, with reports this month that not only has Miley moved Kaitlynn into her Hollywood mansion, but she’s even introduced the blonde to her family.
However, Miley and Kaitlynn’s relationship shouldn’t come as such a shock, explained Spencer Pratt earlier this week. The Hills star told Cosmopolitan that the pair had an "emotional" relationship long before the "Mother's Daughter" singer and Hunger Games star, Liam decided to call time on their decade long romance.