There's a lot of shuffling happening on the charts this week.

After two weeks behind Robin Thicke's mammoth "Blurred Lines," Katy Perry's "Roar" takes the No. 1 spot this week, giving the singer her eighth chart-topper.

Meanwhile, Eminem's sample-friendly new jam, "Berzerk," debuts at No. 3. It stands at No. 2 overall on the Digital Songs chart, right under "Roar."

Another newbie in the top 10 this week is 16-year-old New Zealander Lorde, whose "Royals" enters the elite tier at No. 8 (jumping four spots from last week). It also remains atop the Alternative Songs airplay chart for a fourth consecutive week.

Lorde's debut record, Pure Heroine, is set to release on Sept. 30. "Roar" precedes Perry's PRISM album, which arrives Oct. 22. "Berzerk" comes off Eminem's forthcoming Marshall Mathers LP 2, due Nov. 5.

{youtube}359na4NeaVA|600|338|{/youtube}

{youtube}LFasFq4GJYM|600|338|{/youtube}