A s reported yesterday, Britney Spears becomes the first artist in over three years to debut at No. 1 on the Billboard Hot 100, as her new single, "3," begins its chart life at the top. The track's arrival is fueled by 255,000 first-week digital downloads.

"3" is Spears' third No. 1, following her 1999 debut single "...Baby One More Time" and last year's "Womanizer." The latter set a then-record jump to the top when it soared 96-1 on the Hot 100 chart released exactly one year ago this week. That mark was later bypassed by Kelly Clarkson's "My Life Would Suck Without You," which flew 97-1 in February.

15-year old Canadian singer Justin Bieber has this week's second best Hot 100 debut, at No. 16 with "One Less Lonely Girl." The track immediately surpasses Bieber's current radio single "One Time," which itself reaches a new peak (26-21). Opening week sales of 113,000 downloads propels "Lonely Girl" to its impressive entry.

The "Glee" cast adds two more debuts to its chart take -- now up to nine appearances -- as the medleys "It's My Life/Confessions Part II" (No. 30) and "Halo/Walking On Sunshine" (No. 40) open in the top 40.

Other notable Hot 100 debuts include Chris Brown at No. 52 with "I Can Transform Ya" -- his first appearance as a lead artist since encountering legal troubles earlier this year -- the incarcerated T.I. at No. 54 with "Hell Of A Life" and the return of OneRepublic at No. 58 with "All The Right Moves."

Last week's No. 1, Jay Sean's "Down," falls a spot to No. 2 while also pushing Miley Cyrus' "Party In The U.S.A." from 2-3. Jason DeRulo holds at No. 4 with "Whatcha Say" while "Run This Town" by Jay-Z, Rihanna & Kanye West slips 3-5. The Black Eyed Peas' "I Gotta Feeling" falls 5-6, moving further away from the No. 1 rung it held for a decade-best 14 weeks.

Lady Gaga is the Hot 100's Airplay Gainer for a third straight week with "Paparazzi," though the song also moves down 6-7. Gaga is the only female artist to take the Airplay award for three straight weeks this year, matching her run with "Poker Face" in March and April.

Rounding out the top 10 is Taylor Swift's "You Belong With Me" (7-8), Owl City's "Fireflies" by (11-9) and Kings of Leon's "Use Somebody" (9-10). Owl City's track is the act's first top 10, earned with its first chart entry. "Fireflies" also moves into the top 10 on Hot Digital Songs with 138,000 downloads. The chart's Digital Gainer honoree is Iyaz's "Replay," which rises 24-12.