"There's a part of her that wants to get back together," the source tells Us. "[She's] been lonely."
Earlier this month, the 21-year-old "Wrecking Ball" singer—in the midst of her massive Bangerz world tour—was videotaped mouthing off about a certain ex that broke her heart during a performance at London club Gay on May 9. She tweeted afterward that it wasn't about the Catching Fire star, but Us has learned otherwise.
"Miley was trying to get a rise out of Liam," the source reveals to Us. "She misses him."
Hemsworth, for his part, is trying to move on from their four-year relationship. "He wants to stay clear of her drama," the source tells Us. "He's been dating around."
For more details on Miley and Liam, watch this week's Hot Stuff video, as explained by Us Weekly's Entertainment Director Ian Drew and special guest—TV personality and hair entrepreneur Nyasha Zimucha.