X's by far the biggest recurrent seller in the UK among her peers -
234. Christina Aguilera - Show Me How You Burlesque
466. A Great Big World & Christina Aguilera - Say Something
906. Maroon 5 - Moves Like Jagger (feat. Christina Aguilera) [Studio Recording from the Voice Performance]
935. Christina Aguilera - Dirrty
1026. Christina Aguilera, Lil' Kim, Mýa & P!nk - Lady Marmalade
1157. Christina Aguilera - The Voice Within
1305. Christina Aguilera - Express
286 Beyoncé Check On It (feat. Slim Thug) [discounted]
319 Beyoncé If I Were a Boy
377 Lady Gaga Telephone (feat. Beyoncé) [discounted]
484 Beyoncé Halo
578 Beyoncé Love On Top
626 Beyoncé Single Ladies (Put a Ring On It)
642 Beyoncé Best Thing I Never Had
718 Beyoncé Irreplaceable
767 Beyoncé Crazy In Love
783 Beyoncé Listen (From "Dreamgirls")
893 Beyoncé Run the World (Girls)
1073 Beyoncé Sweet Dreams
289 Katy Perry Roar
363 Katy Perry Firework
365 Katy Perry Unconditionally
429 Katy Perry Wide Awake
684 Katy Perry Dark Horse (feat. Juicy J)
1189 Katy Perry Hot N Cold