POTW: Justin Bieber, Rihanna, Eminem, Kanye, Gwen Stefani
It's a bird! It's a plane! No! It's Katy Perry looking candy-rific during her "Today Show" performance in Rockefeller Center, NYC on Aug. 27.

As previously reported, Rihanna blasts to the Billboard Hot 100 summit, as "What's My Name?," featuring Drake, vaults 60-1 with Airplay Gainer honors.

Rihanna's eighth Hot 100 No. 1 and Drake's first leader debuts at No. 1 on Digital Songs with sales of 235,000, according to Nielsen SoundScan. The track charges 24-16 (48.6 million in audience, up 30%, per Nielsen BDS) on Radio Songs.

Rihanna's 'What's My Name?' Rockets to No. 1 on Hot 100

Katy Perry's "Firework" also makes a big impact this week, exploding 29-10 as the Hot 100's Digital Gainer. Perry's third top 10 from "Teenage Dream," following the No. 1s "California Gurls" and the title cut, bursts 33-6 on Digital Songs (145,000 downloads sold; up 218%) and 39-27 on Radio Songs (37.8 million in audience, up 30%).

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"What's My Name?" dethrones Ke$ha's "We R Who We R," which tumbles to No. 5 after launching atop the list last week. The latter song dips 1-2 on Digital Songs (220,000, down 21%), although it bounds 49-29 (35.3 million, up 45%) on Radio Songs; fueling its airplay rise is a 23-16 advance on Pop Songs with the format's top increase in plays.

Ke$ha Crashes Hot 100 at No. 1 with 'We R Who We R'

Nos. 2 through 4 retain their standings from last week's Hot 100: Far*East Movement's "Like a G6," featuring Cataracs & Dev (No. 2), Bruno Mars' "Just the Way You Are" (No. 3) and Rihanna's second song in the top five, "Only Girl (In the World)" (No. 4).

Nelly's "Just a Dream" descends 5-6 on the Hot 100. As reported yesterday (Nov. 10) in Chart Beat, the song becomes the rapper's fifth No. 1 on Pop Songs. P!nk's "Raise Your Glass" climbs 10-7 on the Hot 100 and Trey Songz's "Bottoms Up" slips 7-8, while Usher's "DJ Got Us Fallin' in Love," featuring Pitbull, drops 6-9.

Nelly's 'Dream' Makes No. 1 a Reality

Twelve songs enter the Hot 100, led by Tim McGraw's "Felt Good on My Lips" at No. 26. Though the track has been swiftly scaling Country Songs, where it lifts 14-13 in its seventh chart week, it storms the Hot 100 following its release as a digital single (64,000 downloads).

Other Hot 100 debuts include Ricky Martin's "Lo Mejor De Mi Vida Eres Tu/The Best Thing About Me Is You," featuring Sonia Jimenez on the Spanish version and Joss Stone on the English version (No. 74); teen pop trio New Hollow, whose CD single of "Sick" (No. 86) sold 28,000 copies, per SoundScan, at girls clothier Justice; and, Jason Aldean's "Don't You Wanna Stay" (No. 93), with Kelly Clarkson, from the former's "My Kinda Party," which bows at No. 2 on the Billboard 200.