Miley Cyrus Says She's 'Fine' But 'Worried' About Sister During Parents' Divorce

Hours after the news broke of her parents' divorce, Miley Cyrus was on the air in Chicago promoting her new single, "We Can't Stop," from an upcoming, still-untitled pop album. 

"She was in a really good mood, and she was talking about how she worked with Snoop Dogg on her album, and we asked her about her hair and her new look,"Showbiz Shelly, entertainment reporter for B96 Radio in Chicago, tells PEOPLE of the Friday broadcast. 

But after the interview, Cyrus – whose father, Billy Ray Cyrus, and mother, Tish Cyrus, announced their split to PEOPLE late Thursday – opened up about more personal matters, including concern for her little sister, Noah.