What was the number one song on January 3 2012?

The number one song on January 3, 2012, was "Sexy and I Know It" by LMFAO. The song was released on October 21, 2011, and reached number one on the Billboard Hot 100 chart on November 12, 2011. It held the number one spot for five consecutive weeks, before being replaced by Adele's "Set Fire to the Rain".