Perry's inextinguishable track ranks at No. 2 on both Digital Songs with 398,000 downloads (down 22%), according to Nielsen SoundScan, and on Radio Songs with 124.5 million listener impressions (down 1%), according to Nielsen BDS.
Mars' "Grenade," which drops to No. 2 on the Hot 100, holds atop Digital Songs for a third week with a still-healthy 425,000 downloads (down 24%), the 11th best sales week since SoundScan began tracking digital track sales in 2003. The song's total a week ago (559,000) stands as the third-highest weekly sum.
A week ago, the Christmas holiday bumped up against the end of SoundScan's tracking week (Sunday, Dec. 26) and in turn, the annual mp3 and gift card-sales effect seems to have spilled over into two weeks. Digital sales dip only 4% from a week ago. Last year's week to week dip in the comparable frames was 26%. This week's total is 13% greater than the seven-day period which included New Year's Day 2010.
Back to the Hot 100 top 10, Ke$ha 's "We R Who We R" holds at No. 3, while "What's My Name?" by Rihanna  featuring Drake  and P!nk 's "Raise Your Glass" also hold in place at Nos. 4 and 5, respectively. Rihanna's track continues atop the Radio Songs chart for a third week.
Wiz Khalifa  steps down two spots to No. 8 with "Black And Yellow," Bruno Mars inches back up 10-9 with "Just the Way You Are" and Nelly 's "Just a Dream" ventures back into the top 10 (12-10).
Taylor Swift 's former top 10 "Mine" is the chart's top Airplay Gainer, rebounding 42-31 with almost 50% of its 7.5 million audience gain coming from adult contemporary radio stations which transition back to normal programming following extended runs playing Christmas music.
Nickelodeon acts grab a pair of Hot 100 honors this week thanks to the network filling up a bulk of its New Year's Eve weekend with multiple episodes of its hit series "Victorious" and "Big Time Rush." The "Victorious" Cast featuring Victoria Justice cops the list's Digital Gainer award, leaping 58-50 with a 20% download spike to 79,000 for "Freak the Freak Out." Meanwhile, network sibling Big Time Rush  takes Hot Shot Debut honors, indicating the highest new entry on the list, at No. 79 with "Big Night" which sells 46,000 (up 105%).
The only other debut on the list in this sleepy week belongs to Sara Evans , who starts at No. 98 with "A Little Bit Stronger."
- News