Jamie Lynn teared up during her performance of "I Look Up To You" in Chicago earlier this week.
JL previously told fans the song's about her bigger sis, Britney.
"I just call her up if there is anything that I need to hear from or need advice on," JL recently said in an interview. "It's just a sister thing. It's not really anything about the job. But it is nice having someone whose obviously been very successful and been through it all to be able to tell you little secrets here and there."
"She thinks it's brave that I am out there really laying it on the line with some of my lyrics," she added said. "So I think that we do influence just as far as the craft goes even though it is two completely different sounds."