Miley Cyrus is "concerned" for her younger sister in the wake of her parents' split.

The "We Can't Stop" hitmaker, whose mother Tish filed for divorce from her husband Billy Ray Cyrus on Thursday after 19 years of marriage, is reportedly doing fine but is worried about her 13-year-old sister Noah. The 20-year-old singer promoted her new single in Chicago just hours after news of her parents' divorce broke and discussed it during an off-air chat with B96 Radio's Showbiz Shelly, who told People.com, "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. With everything that's happened, she was very nice and really didn't seem affected. If she was, she was covering it up really well. We really enjoyed having her."

When asked how she's coping with the divorce news, Miley allegedly said, "Oh, I'm fine. I'm okay. I'm much more concerned for my sister [Noah]. She's 13."

Noah asked people to support her and her family on Friday, tweeting, "Please pray for me and my family."

Tish is seeking full physical and legal custody of Noah and has cited "irreconcilable differences" as the reason for the split, which comes just three years after Billy Ray filed for divorce, blaming it on Miley's starring role on Hannah Montana, but he later dropped his petition in a bid to make their marriage work.