The Hot 100 continues to just be ridiculously, incessantly "Happy" this week. For the ninth time in a row, the seemingly unstoppable Pharrell Williams sits atop the Billboard Singles Chart. However, unlike the last three weeks, there's been a bit of a shakeup at the top of the chart.

For the first time in its history, the top seven songs on the Billboard Hot 100 were stagnant for three straight weeks, but this week, such mundane rankings were shaken up just a little bit.

Yes, "Happy" still sits atop the chart, after blowing other songs out of the water by topping digital sales, radio plays and streams, according to Billboard. And beneath "Happy," John Legend still sits at No. 2 with "All Of Me." Yawn.

But, then, a shakeup on the horizon! Jason Derulo's "Talk Dirty" and Katy Perry's "Dark Horse" did a flip. Derulo rises again to his peak at No. 3, while Perry falls to a recent low at No. 4.

Nos. 5 and 6 still hold steady, with Idina Menzel's highlight Frozen soundtrack song "Let It Go" keeping in the mid-range above Bastille's "Pompeii."

Beneath that, DJ Snake and Lil Jon get turnt up with "Turn Down For What," which reached a new peak at No. 7. The ratchet jam got a boost from the No. 8 spot thanks to a boost in sales, streaming and radio impressions. Last week, "Turn Down For What" sold 120,000 copies, entering the top five on the Digital Sales chart.

The top 10 got two new debuts this week, with Justin Timberlake's love jam "Not A Bad Thing" rising to No. 8. The track sold 88,000 copies last week, had 79 million radio impressions and was streamed 1.9 million times The other entry this week goes to troubled singer Chris Brown, whose new single "Loyal" boosted to No. 9.

Lorde's "Team" rounds out the top 10, of course, at No. 10.

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