The pregnant 33-year-old, who's seven weeks away from giving birth to her second child, choked up while singing "Piece By Piece."
After her performance, Kelly apologized for crying!
"I'm pregnant and nostalgic and I can't believe it's the last season and yeah, really sorry I just bawled," she said.
No need to apologize, Kelly! You were awesome!
Watch the E! News video above to see Kelly's performance!