Rihanna's latest hit "Stay" has become her 10th #1 hit on Billboard's Pop Songs chart. That gives Rihanna more chart toppers than any other artist. Katy Perry & RiRi at one time were tied at 9 #1 hits on the chart. Now, starting in 06' with her hit "SOS" to her latest hit "Stay" she rains as the biggest chart topper in Billboard history. Congrats Rihanna!