Although Miley and the Victoria's Secret model hung out at SXSW in March, the ladies first spurred relationship rumors on June 20, when they were seen leaving an NYC hotel together.
And since then, things are only getting hotter and more serious. "They’ve barely spent a night apart in the past month," a source tells OK!.
The source adds that Miley wasn't looking for something serious after her public split from Patrick in April, though Stella seems to be just what Miley needs to get over him for good.
But what's next for Miley and Stella, who met through Miley's assistant?
For more on the story, pick up the latest issue of OK! magazine, on stands now.