Plus, Brenda Lee's "Rockin' Around the Christmas Tree" vaults to a new No. 8 best.

The Weeknd blasts to his fourth No. 1 song on the Billboard Hot 100, as "Heartless" vaults from No. 32 to the top spot in its second week on the chart.

Plus, two holiday classics return to the Hot 100's top 10: Mariah Carey's 1994 carol "All I Want for Christmas Is You" surges from No. 18 back to its No. 3 high, first reached last holiday season, and Brenda Lee's 1960 standard "Rockin' Around the Christmas Tree" hits a new peak, roaring 29-8.

Let's run down the top 10 on the Hot 100 (dated Dec. 14), which blends all-genre U.S. streaming, radio airplay and sales data. All charts will update on Billboard.com tomorrow (Dec. 10).

Here's a deeper dive into The Weeknd's new Hot 100 No. 1. The song, released Nov. 27 on Republic Records, is the 1,094th leader in the chart's 61-year history.

Sales, streams & airplay: "Heartless" bounds 15-1 on Digital Song Sales with 58,000 sold in the week ending Dec. 5, according to Nielsen Music (a sum comprising download sales, as well as CD and vinyl singles available on The Weeknd's official website). The track sold 10,000 on Nov. 27-28.

"Heartless" flies 32-2 on Streaming Songs with 30 million U.S. streams in the week ending Dec. 5, aided by the Dec. 3 premiere of its official video. The song drew 13.8 million streams on Nov. 27-28.

The track also charges 45-38 on Radio Songs, with 26.2 million in all-format airplay audience, after beginning with 22.6 million on Nov. 27-Dec. 1.

The Weeknd's fourth No. 1: The Weeknd adds his fourth Hot 100 No. 1. He earned his first two leaders in August and October 2015, respectively: "Can't Feel My Face," which reigned for three weeks, and "The Hills," for six. In January 2017, he led for a week with "Starboy," featuring Daft Punk.

"Heartless" is also The Weeknd's ninth Hot 100 top 10 and first since "Call Out My Name," which debuted and peaked at No. 4 in April 2018.

Writers & producers: The Weeknd wrote "Heartless" with Leland "Metro Boomin" Tyler Wayne, Carlo "Illangelo" Montagnese and Andre "Dre Moon" Eric Proctor.

The Weeknd has co-written all four of his Hot 100 No. 1s. Metro Boomin earns his second No. 1 as a writer, following Migos' "Bad and Boujee," featuring Lil Uzi Vert, in 2017; Illangelo tallies his second topper as a writer, following "The Hills"; and Dre Moon shines with his first No. 1 as a writer.

The Weeknd, Illangelo and Metro Boomin co-produced "Heartless," marking each of their second No. 1s in that role, after "The Hills" for the former two and "Bad and Boujee" for Metro Boomin.

Coldest stories ever told: The Weeknd brings the title "Heartless" to No. 1 on the Hot 100 for the first time, surpassing the No. 2 peak for Kanye West's different composition of the same name in 2009. (Subsequently that year, covers of West's hit, by Kris Allen and The Fray, reached Nos. 16 and 79, respectively.)

Quirkily, Heart charted the first "Heartless," a No. 24 hit for the rock band in 1978.

'Blinding Lights' bows: The Weeknd concurrently debuts at No. 11 on the Hot 100 with fellow new song "Blinding Lights." Released Nov. 29, the song starts at No. 2 on Digital Song Sales (24,000) and No. 6 on Streaming Songs (24.8 million).

Both "Heartless" and "Blinding Lights" are expected to be on The Weeknd's upcoming album; of the two, "Heartless" is receiving official radio promotion.

No. 1 R&B/hip-hop: "Heartless" also climbs 14-1 on Hot R&B/Hip-Hop Songs and 3-1 on Hot R&B Songs (both of which employ the same multi-metric methodology as the Hot 100). The Weeknd notches his fifth No. 1 on the former chart and his sixth on the latter.

"Heartless" dethrones Post Malone's "Circles" atop the Hot 100, after the latter led the list for two weeks. "Circles" ranks at No. 2 on Radio Songs (92.2 million, up 1%), No. 4 Digital Song Sales (13,000, down 36%) and No. 8 on Streaming Songs (22.2 million down 10%).

Mariah Carey dashes 18-3 on the Hot 100 with "All I Want for Christmas Is You," returning to its peak to-date first reached last holiday season (on the chart dated Jan. 5, 2019), when it became the first top-five holiday hit on the survey in 60 years. It's the highest-charting holiday song by a soloist in the Hot 100's archives, bested overall in the category only by The Chipmunks' "The Chipmunk Song" (with David Seville), which ruled for four weeks in 1958-59.

"Christmas" takes an 11-1 sleigh ride on Streaming Songs, up 48% to 35.1 million U.S. streams, as the song scores its second week atop the chart (and its second-best streaming week, after it led the Jan. 5 ranking with 51.9 million). It jumps 29-10 on Digital Song Sales (9,000, up 60%) and 38-32 on Radio Songs (31 million, up 18%).

"Christmas" tops the multi-metric Holiday 100 chart for a 37th total week, of the 42 overall frames in the chart's history, dating to its 2011 inception.

Click here for a recap of the song's history on the Hot 100 and other charts since its 1994 release on Carey's album Merry Christmas, which jingles 21-9 on the Billboard 200.

Lewis Capaldi's "Someone You Loved" drops 2-4 on the Hot 100, after the ballad logged three weeks at No. 1; Maroon 5's "Memories" slips to No. 5 from its No. 4 high; Lizzo's "Good as Hell" slides to No. 6 from its No. 3 peak, as it rules Radio Songs for a third week (100.6 million, up 2%); and Arizona Zervas' "Roxanne" backtracks to No. 7 on the Hot 100 from its No. 5 highpoint, while leading Hot Rap Songs for a second frame.

Brenda Lee's "Rockin' Around the Christmas Tree" dances merrily from No. 29 to No. 8 on the Hot 100, marking a new high, after it hit a prior No. 9 best last holiday season, when it entered the top 10 for the first time, over 58 years after it first appeared on the chart.

The track rockets 23-4 on Streaming Songs (32.8 million, up 61%); re-enters Digital Song Sales at No. 33 (4,000, up 68%); and ascends 48-43 on Radio Songs (24.4 million, up 14%).

Rounding out the Hot 100's top 10, Selena Gomez's "Lose You to Love Me" retreats 6-9, after becoming her first No. 1, and Dan + Shay and Justin Bieber's "10,000 Hours" falls 8-10, after debuting at its No. 4 peak, as it leads the multi-metric Hot Country Songs chart for a ninth week.

Find out more Hot 100 news on Billboard.com this week, and, for all chart news, you can listen (and subscribe) to Billboard's Pop Shop Podcast and follow @billboard and @billboardcharts on both Twitter and Instagram. And again, be sure to visit Billboard.com tomorrow (Dec. 10), when all charts, including the Hot 100 in its entirety, will refresh.