The impressed panel of judges gave Pickler and her partner, Derek Hough, a high score of 26 points and commended the singer for her dancing abilities.
"For week two, last week was a spark. This is a fire. Well done," judge Len Goodman told the singer.
Pickler and Hough tied for the highest score of the night with fellow contestants Zendaya and her partner Val Chmerkovskiy.