Most weeks at #1 on Hot 100 Recurrents during 2011:
5 - Dynamite, Taio Cruz
4 - All I Want For Christmas Is You, Mariah Carey
3 - Teenage Dream, Katy Perry
3 - Rhythm Of Love, Plain White T's
2 - Need You Now, Lady Antebellum
2 - Just The Way You Are, Bruno Mars
2 - California Gurls, Katy Perry featuring Snoop Dogg
2 - Firework, Katy Perry
2 - Jar Of Hearts, Christina Perri
2 - E.T., Katy Perry featuring Kanye West
2 - Barefoot Blue Jean Night, Jake Owen
2 - Just Can't Get Enough, The Black Eyed Peas
2 - Crazy Girl, Eli Young Band
Most weeks on Hot 100 Recurrents during 2011:
50 - Need You Now, Lady Antebellum
48 - I Gotta Feeling, The Black Eyed Peas
35 - Hey, Soul Sister, Train
34 - Dynamite, Taio Cruz
33 - DJ Got Us Fallin' In Love, Usher featuring Pitbull
33 - Secrets, OneRepublic
27 - Tonight (I'm Lovin' You), Enrique Iglesias featuring Ludacris & DJ Frank E
27 - Raise Your Glass, P!nk
27 - Teenage Dream, Katy Perry
24 - Just The Way You Are, Bruno Mars
Source
Her era is also one of the oldest in the top 20. Slaying! 
