After 10 weeks of a "Happy" reign on the Hot 100, Pharrell Williams' peppy chart-topping single has finally been overtaken, and it only took everything John Legend had in him. Yes, after six weeks sitting in the runners-up slot, "All Of Me" is the new No. 1 song in the country.

According to Billboard, the race between "Happy" and "All Of Me" this week was razor thin, with the two hits coming only within .009% of each other in chart points. The two songs have been in a battle over the rule of streaming, digital sales and radio play for two months now, but now "All Of Me" finally won out, giving Legend his first-ever No. 1 single on the Billboard Hot 100.

Though the reign of men is still present on the Hot 100, a relative musical newcomer is looking to take over the charts for the summer. This week, Ariana Grande's sizzling, minimalistic single "Problem" (feat. Iggy Azalea) rockets with a No. 3 start on the Hot 100, only .013% behind "All Of Me" (meaning she just narrowly missed both a No. 2 and No. 1 starting point).

Grande rocketed near the top of the charts thanks to massive digital sales of "Problem," which moved 438,000 copies in its first week, making it the eighth best debuting digital single of all time.

Like Legend's "All Of Me," "Problem" is Grande's best Hot 100 showing to date. Previously, she maxed out last year with her debut single "The Way" at No. 9.

Iggy Azalea is having her best week in the charts for the start of May as well. Not only is she the featured artist on "Problem," but the rapper's own new single "Fancy" (feat. Charli XCX) rose to No. 4. The three spot boost in chart rankings comes thanks to a rise in sales (221,000 copies sold), streaming (6.6 million plays) and radio impressions (55 million).

Though the very tippy top of the Billboard Hot 100 got a long-awaited shakeup this week, the bottom six slots of the top 10 is still comprised of familiar fare. Katy Perry's former No. 1 "Dark Horse" slips to No. 5 after maintaining a No. 3 stance for several weeks. Jason Derulo is talking dirty at No. 6, followed closely by Lil Jon and DJ Snake's "Turn Down Dor What" at No. 7.

Justin Timberlake keeps maintaining that love is "Not A Bad Thing" with a No. 8 peak on the Hot 100, and Idina Menzel's chilly self-empowerment anthem "Let It Go" stormed down from No. 6 to No. 9. Finally, Bastille is soon to be Hot 100 top 10 history just like "Pompeii," as that track slides to No. 10.

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