For the third week in a row, Australian rapper Iggy Azalea is on top of the Billboard Hot 100 chart with her hit single "Fancy" featuring British singer/songwriter Charli XCX. The cheeky music video stars the pair as the main characters from the classic 90s film Clueless, which made the song an even bigger hit, and now Iggy's sure to be celebrating her success. Azalea is also at the no.2 spot on the famous countdown, although it's for her feature on Ariana Grande's "Problem". Coming in at number three is John Legend's legendary serenade to wife Chrissy Teigen, "All Of Me", while the party-banger by DJ Snake & Lil Jon, "Turn Down For What", holds the #4 position. Slowly but surely creeping down the chart is Pharrell's "Happy", which has been on the Hot 100 for a staggering 22 weeks. Something to be "happy" about, for sure!