Katy Perry posts back-to-back No. 1s on the Billboard Hot 100, as "Teenage Dream" is set to top the chart when it's released in full tomorrow morning (Sept. 9).

The last female artist to post successive No. 1 singles on the chart was Lady Gaga, who took her first two entries, "Just Dance" and "Poker Face," to the summit in the first half of 2009.

Perry spent six weeks at No. 1 with her last radio single "California Gurls" earlier this summer, accumulating enough time in the upper reaches of the chart to lead the Summer Songs tally for most of the season. The final ranking of Top Summer Songs will also be announced tomorrow. On this week's Hot 100, "California Gurls" dips 7-10. 

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"Teenage Dream" makes its surge to No. 1 thanks in part to a copping a second straight Airplay Gainer award, topping 100 million listener impressions for the first time with a 19% audience gain (7-5 on Radio Songs), according to Nielsen BDS. The track holds at No. 1 for a second week on Digital Songs with 221,000 (down 15%), according to Nielsen SoundScan.

Perry supplants Eminem, who was also enjoying a back-to-back No. 1 run on the Hot 100. "Love the Way You Lie," featuring Rihanna, led for the past seven weeks (1-2), while his last single "Not Afraid" topped the chart for a week in May.

Elsewhere in the top 10, Taio Cruz's "Dynamite" holds at No. 3, Bruno Mars' "Just the Way You Are" jumps 6-4 and "I Like It" by Enrique Iglesias featuring Pitbull slips 4-5.

Usher's "DJ Got Us Fallin' In Love," featuring Pitbull, is pushed down 5-6, Taylor Swift's "Mine" moves 9-7 and "Take It Off" by Ke$ha rises 10-8.

Nelly returns to the Hot 100 top 10 for the first time in more than four years as "Just a Dream" climbs 13-9. The rapper was last in the upper tier when "Grillz," featuring Paul Wall, Ali & Gipp, topped the list for two weeks in January 2006.

Cee Lo Green makes the chart's largest leap as "F**k You (Forget You)" soars 96-33 with Digital Gainer honors. On the Digital Songs chart, the track moves 69-19 with 59,000 downloads (up 180%).

Also making a notable Hot 100 jump is "Like a G6" by Far*East Movement featuring Cataracts & Dev (41-21). The song improves 25-12 on Digital Songs (75,000, up 54%), while airplay impressions increase by 49% to 19.8 million.

The chart's top debut is George Strait's "The Breath You Take," which comes in at a modest No. 95. The list's other two debuts are fellow Country Music Association Award nominees Miranda Lambert and Brad Paisley, who arrive with "Only Prettier" (No. 96) and "Anything Like Me" (No. 100), respectively. The 44th Annual CMA Awards will be handed out Nov. 10 on ABC.