Iggy Azalea still rules the Billboard Hot 100.

The "New Classic" rapper's hit "Fancy" featuring Charli XCX celebrates its fourth week at No. 1 spot on the chart.

While her latest single also takes over the Radio Songs airplay chart (2-1), the Australian emcee holds at No. 2 as a featured artist on Ariana Grande's smash "Problem" as well. According to Nielsen BDS, "Fancy" gains by 7 percent to 145 million in all-format audience impressions, however drops in sales and streaming for a third week. On the Digital Songs list, leading for four weeks, the hit track strongly holds at No. 1 with 226,000 downloads sold, but decreasing by 14 percent. Also, it tops the Streaming Songs chart for its fifth week to 12.2 million U.S. streams, down by 2 percent.

Azalea once again holds off collaborator Grande from topping the Hot 100 chart. "Problem" gains at radio but decreases in sales and streaming -- as it pushes 4-3 on Radio Songs, increasing by 11 percent to 127 million. It still holds at its No. 2 peak on the Streaming Songs list to 10.6 million, down by 11 percent, and steps down 2-3 on Digital Songs with 186,000 downloads sold, decreasing by 13 percent. Now in its seventh week on the chart, the track spent its first three frames at No. 1.

The Aussie rapper's catchy song won over Ariana Grande's track by 15 percent for the previous two weeks. As of now, "Fancy" and "Problem" went down by 5 and 6 percent respectively in overall Hot 100 chart, so Azalea still wins by 17 percent more points.

"Fancy" off Iggy Azalea's debut studio album "New Classic" tops the sales/airplay/streaming-based Hot R&B/Hip-Hop Songs and Hot Rap Songs charts for its fourth and ninth week, respectively, while leading the Songs of the Summer ranking for a third week.