Lady Gaga Scored Her First Billboard #1 with 'Just Dance' + Jay Leno Performance'!

It's been a slow and steady climb, but Lady Gaga finally made it to the top spot! Yesterday, she earned her first #1 on the Billboard Hot 100 Singles Chart with her Grammy-nominated smash single, "Just Dance"! After 22 weeks, this was the longest climb to the top since Creed's "With Arms Wide Open" in November 2000.

To celebrate her latest victory, she appeared on the Tonight Show with Jay Leno and gave another show-stopping performance of "Just Dance"! Check out Lady Gaga as she tears it up again!

And don't forget to enter the "Just Dance" Dance-Off on IBeatYou.com!