1. The Black Eyed Peas' "I Gotta Feeling" was No. 1 on the Hot 100 for the entire month. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF UMG 2. While Linkin Park's "New Divide" continued being the No. 1 alternative song in the country. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF WMG 3. Daughtry's Leave This Town and Demi Lovato's Here We Go Again were among the biggest-selling albums in the country. RCA, Hollywood Records 4. Miley Cyrus released her bop-tastic classic "Party in the U.S.A." Hollywood Records 5. And she performed the song at the Teen Choice Awards: View this video on YouTube youtube.com 6. Also, in case you forgot, the Teen Choice Awards were hosted by the Jonas Brothers... Kevin Winter / Getty Images 7. ...and Twilight was the big winner of the night — it took home 10 awards. Kevin Winter / Getty Images 8. Emily Blunt and John Krasinski announced that they were engaged. John Shearer / WireImage 9. Michael Jackson's death was ruled a homicide. Tim P. Whitby / Getty Images 10. DJ AM died at age 36 from an accidental overdose. Tim Mosenfelder / Getty Images 11. Senator Ted Kennedy died at age 77 of brain cancer. Chip Somodevilla / Getty Images 12. Filmmaker John Hughes died of a heart attack at age 59. Paul Natkin / WireImage 13. Sonia Sotomayor was sworn in as a Supreme Court Justice. Paul J. Richards / AFP / Getty Images 14. Kourtney Kardashian announced that she was pregnant with her first child and that Scott Disick was the father. Gustavo Caballero / Getty Images 15. Rumors began to circulate that Bradley Cooper and Jennifer Aniston had broken up, and that he was now dating Renée Zellweger. Us Weekly 16. Rumors were also swirling that Jennifer had moved on to Gerard Butler (the two were filming their movie The Bounty Hunter together at the time). Jeff Vespa 17. Trace Cyrus called the Jonas Brothers fake in an interview with Details magazine. Martin Philbey / Redferns, Eric Mccandless / Getty Images 18. ABC announced the cast for Season 9 of Dancing with the Stars. Craig Sjodin / Walt Disney Television via Getty The cast included Melissa Joan Hart, Macy Gray, Ashley Hamilton, Mýa, Kathy Ireland, Mark Dacascos, Michael Irvin, Joanna Krupa, Donny Osmond, Louie Vito, Chuck Liddell, Aaron Carter, Kelly Osbourne, Debi Mazar, Natalie Coughlin, and Tom DeLay. 19. The third season of Mad Men premiered... amc.com 20. ...and, as part of the promotion, AMC had everyone "Mad Men-ing" themselves (aka making avatars of themselves). amc.com 21. Shark Tank made its debut... Frederick M. Brown / Getty Images 22. ...as did Kourtney & Kim Take Miami. hulu.com 23. Paula Abdul announced on Twitter that she would not be returning to American Idol. Paula Abdul @PaulaAbdul With sadness in my heart, I’ve decided not to return to #IDOL. I’ll miss nurturing all the new talent, but most of all..Cont'd... 02:27 AM - 05 Aug 2009 Reply Retweet Favorite 24. "Python vs Alligator" was the big viral video everyone was watching and sharing: View this video on YouTube youtube.com 25. The Three Wolf Moon T-shirt continued being a huge internet phenomena. amazon.com 26. Julie & Julia, G.I. Joe: Rise of the Cobra Movie, Inglourious Basterds, and District 9 were among the movies released into theaters. Sony, Paramount, Miramax, Tri-Star 27. And finally, Disney surprised everyone by announcing they were going to buy Marvel for $4 billion. Disney, Marvel And I think we can all agree that it was money well spent!