Mendes earns his first leader and Cabello, her second.

Shawn Mendes and Camila Cabello climb to No. 1, from No. 2, on the Billboard Hot 100 with "Señorita," marking Mendes' landmark first leader on the list and Cabello's second.

Plus, Lizzo hits a new Hot 100 high with "Truth Hurts," which rises 4-3 while reaching No. 1 on both the Hot R&B/Hip-Hop Songs and Hot Rap Songs charts, and Lil Tecca takes over atop the Streaming Songs chart with his breakthrough hit "Ran$om," which ascends 8-5 on the Hot 100.

Let's run down the top 10 of the Hot 100 (dated Aug. 31), which blends all-genre U.S. streaming, radio airplay and sales data. All charts will update on Billboard.com tomorrow (Aug. 27).

"Señorita," a joint release on SYCO/Island/Epic/Republic Records, becomes the 1,088th No. 1 in the Hot 100's 61-year history.

The collaboration holds at No. 3 on the Radio Songs chart, with 102.4 million audience impressions, up 6% (good for top Airplay Gainer honors on the Hot 100), in the week ending Aug. 25, according to Nielsen Music, and No. 4 on Streaming Songs (37.5 million U.S. streams, up 3%, in the week ending Aug. 22). On Digital Song Sales, it dips 4-5 (22,000 downloads sold, down 4%, in the week ending Aug. 22).

Mendes' first No. 1: Mendes notches his first Hot 100 leader among five top 10s, dating to his first, the No. 4-peaking "Stitches," in 2015. Until this week, he peaked at No. 2 with both "Señorita," which arrived at the rank in early July (and then spent seven more weeks between Nos. 2 and 5), and his own "If I Can't Have You," which debuted and peaked at No. 2 in May.

Cabello crowns the Hot 100 for a second time, after leading with "Havana," featuring Young Thug, on the chart dated Jan. 27, 2018.

"Señorita" is the second charted Mendes and Cabello duet, following "I Know What You Did Last Summer," which rose to No. 20 on the Hot 100 in January 2016.

Producers & writers: "Señorita" producers Benjamin "benny blanco" Joseph Levin and Andrew "Watt" Wotman collect their eighth and first Hot 100 No. 1, respectively, in credited production roles.

Eight writers composed "Señorita": Mendes, who celebrates his first Hot 100 No. 1 as a writer; Cabello (second); blanco (eighth); Watt (second); Alexandra "Ali" Tamposi (third); Jack Patterson (first); Magnus Hoiberg (first); and Charli XCX (aka, Charlotte Aitchison), who tallies her second, after co-writing Iggy Azalea's breakthrough 2014 leader "Fancy," featuring Charli XCX.

Leading labels: As for the labels promoting "Señorita," Republic scores its fourth Hot 100 No. 1 this year, while Epic returns to the top after last leading via Travis Scott's "Sicko Mode" in December.

SYCO adds its third total Hot 100 No. 1, following Cabello's "Havana" and Leona Lewis' "Bleeding Love" in 2008, while Island paces the Hot 100 for the first time since the song that supplanted Lewis' at No. 1, Mariah Carey's "Touch My Body."

Just duet: "Señorita" is the second Hot 100 No. 1 of 2019 between a co-billed male and female soloist, following Lady Gaga and Bradley Cooper's "Shallow," which topped the March 9 tally. The last year with two such No. 1s? 1987, when Aretha Franklin and George Michael's "I Knew You Were Waiting (For Me)" led for two weeks that April and Bill Medley and Jennifer Warnes' Dirty Dancing classic "(I've Had) The Time of My Life" ruled for a week that November.

Radio ruler: As previously reported, "Señorita" hits No. 1 on the Pop Songs airplay chart. Meanwhile, Mendes' own "If I Can't Have You" takes over atop Adult Pop Songs. The double victory makes Mendes the first male artist to lead both lists simultaneously with different songs.

Notably, as Cabello, 22, earns her second Hot 100 No. 1 and fourth Pop Songs leader, she's the youngest artist to hit those levels since Justin Bieber in 2017, and the youngest female since Rihanna back in 2010.

Billie Eilish's "Bad Guy" drops to No. 2 on the Hot 100 a week after ascending to No. 1. The track holds at No. 3 on Streaming Songs (38.9 million, down 1%) and No. 6 on Radio Songs (91.1 million, down 3%), while slipping 6-7 on Digital Song Sales (20,000, up 1%).

Lizzo's "Truth Hurts" climbs to new Hot 100 high (4-3), as it pushes 5-2 on Digital Song Sales (26,000, up 17%, as it claims the Hot 100's top Sales Gainer award); repeats at No. 4 on Radio Songs (99.1 million, up 4%); and lifts 7-6 on Streaming Songs (28.4 million, up 6%). The track also rises 2-1 on both Hot R&B/Hip-Hop Songs and Hot Rap Songs, becoming Lizzo's first leader on each list; it conquers the longest-leading No. 1 in the history of both charts, dethroning Lil Nas X's "Old Town Road," featuring Billy Ray Cyrus, after the smash totaled a record 20 weeks at the summit on each survey.

On the Hot 100, "Road" retreats 3-4 after reigning for a record 19 weeks. It descends to No. 2 on Streaming Songs after a record 20 weeks at No. 1 (50.7 million, down 5%) and tumbles to No. 4 on Digital Song Sales (23,000, down 12%) after 16 weeks on top; it remains a week off the record for the most time atop the latter list, after Luis Fonsi and Daddy Yankee's "Despacito," featuring Bieber, dominated for 17 weeks in 2017. On Radio Songs, "Road" falls 28-35 (28.4 million, down 17%).

"Road" rules the Songs of the Summer chart for a 13th frame, having paced the survey each week since its annual return after Memorial Day.

("Road," as of this week, is back to having kept a record-tying five songs peaking at No. 2 on the Hot 100 during its command, with "Señorita" and "Bad Guy" having both now risen from No. 2 highs first reached under "Road." The five titles to reach No. 2 bests below "Road," listed chronologically by peak date: Post Malone's "Wow."; Taylor Swift's "ME!," featuring Brendon Urie; Mendes' "Can't"; Ed Sheeran and Bieber's "I Don't Care"; and Swift's "You Need to Calm Down.")

Lil Tecca lands his first top five Hot 100 hit and first Streaming Songs No. 1, as "Ran$om" rises 8-5 on the former chart and 2-1 on the latter (52.3 million, up 21%, as it earns the Hot 100's top Streaming Gainer nod for a second consecutive week). The rapper's breakthrough hit also bullets at No. 39 on Digital Song Sales (5,000, up 8%) and builds by 21% to 15 million in radio reach.

Khalid's No. 3 Hot 100 hit "Talk" backtracks 5-6, while leading Radio Songs for an 11th week (121.2 million, down 3%) and Hot R&B Songs for an 18th frame.

Rounding out the Hot 100's top 10, Chris Brown's "No Guidance," featuring Drake, falls to No. 7, after reaching No. 6; Sheeran and Bieber's No. 2-peaking "Care" slides 7-8; Post Malone's "Goodbyes," featuring Young Thug, holds at No. 9, after debuting at its No. 3 best; and Mendes' "Can't" keeps at No. 10.

Beyond the Hot 100's top 10, Swift's "Lover" debuts at No. 19. It launches at No. 1 on Digital Song Sales, with 35,000 sold, marking her record-extending 18th leader (ahead of runner-up Rihanna's 14). The song is the title track from her new LP, which, released Friday (Aug. 23), has already become 2019's top-selling album in the U.S. Four songs from the album, which is set to debut atop next week's, Sept. 7-dated Billboard 200 chart, have hit the Hot 100 so far, as "Lover" joins the twin No. 2 hits "ME!" and "Calm," as well as "The Archer" (No. 69; Aug. 3).

Find out more Hot 100 news on Billboard.com this week, and, for all chart news, you can listen (and subscribe) to Billboard's Chart Beat Podcast and Pop Shop Podcast and follow @billboard and @billboardcharts on both Twitter and Instagram. And again, be sure to visit Billboard.com tomorrow (Aug. 27), when all charts, including the Hot 100 in its entirety, will refresh.