Billboard Hot 100.

Katy Perry has knocked Eminem and Rihanna to the top in the U.S. Billboard The singer took the number one spot after seven weeks on the chart, while her album of the same name, Teenagre Dream, also debuted in the first position. Note that Katy Perry has achieved historical record on the Billboard singles making two straight at # 1, other artists who achieved this record are Michael Jackson, Madonna, Mariah Carey, Shakira and Paul McCartney.

Behind Katy Perry, Bruno is Mars, which reached a new peak with his solo debut 'Just The Way You Are', from 6 to 4.

Ke$ha also rose eight positions to number ten with his song, 'Take It Off', while Nelly track back with 'Just A Dream'.