Number ones - Rihanna 'Only Girl - In The World'

who is currently the biggest pop star? You’d probably say Lady Gaga or Katy Perry – they’re the ones people parody and cover on YouTube, they’re the names you’d casually drop in conversation, theirs are the songs from the pop charts you’d be most likely to know. But, if you asked the ARIA singles charts, Rihanna would be its answer. Here’s why: 'Only Girl (In The World)' is her third Australian #1 single of 2010. No other singer has had more than one #1 this year. It also debuted at #1 this week, knocking off 'Dynamite' by Taio Cruz. Debuting at #1 is another sign of star power: your standard insidiously catchy song might take a few weeks to seep into the brains of people who buy singles, but this one came with a readymade fan base who bought the song simply because it’s by Rihanna.