Kellie Pickler was back on the Idol stage to perform her new hit single "Best Days Of Your Life" at the Top 8 results show. The song was co-written by Kellie's "little sister" Taylor Swift and is from Kellie's self-titled sophomore album. Her album recently went number one on the Billboard Country Album Chart, making her only the sixth country artist to have their debut and follow-up albums enter at the top of the charts. Winner of three 2008 CMT Awards, Kellie penned five of the album's tracks, including "Best Days of Your Life." Since last month, Kellie has been the opening act for Taylor Swift on the "Fearless Tour 2009." The six-month tour will visit 52 cities in 38 states and provinces across the U.S. and Canada.

Kellie dazzled on the Top 8 results show and had the crowd up on their feet. She performed up close and personal with Randy and Simon, proving that she's still a "naughty little minx." To watch the performance again, click here.