"Un-Thinkable (I'm Ready)" is a song by American singer-songwriter Alicia Keys from her fourth studio album The Element of Freedom (2009). It was initially scheduled to be the fifth single, but it was released as the fourth single. It was her first single to reach number one on the R&B chart in the United States since 2007's "Like You'll Never See Me Again"."Un-Thinkable (I'm Ready)" spent twelve consecutive weeks atop the Billboard Hot R&B/Hip-Hop, the longest-running number-one single of 2010, when the single was in its 12th week on top of the chart, Keys has completed a total of 54 weeks at #1 on the chart.