I Kissed A Girl - 10,000,000+
Hot N Cold - 10,000,000+
Thinking Of You - 1,500,000+
Waking Up In Vegas - 3,500,000+

California Gurls - 9,000,000+
Teenage Dream - 8,000,000+
Firework - 11,000,000+
E.T. - 7,000,000+
Last Friday Night (T.G.I.F.) - 4.500.000+
The One That Got Away - 3,000,000+
Part Of Me - 3,000,000+
Wide Awake - 4,000,000+

Roar - 6,000,000+
Unconditionally - 500,000+
Dark Horse - 5,000,000+
Birthday - 500,000+
This Is How We Do 500,000+
Album tracks - 3 million

One Of The Boys 3,500,000
Teenage Dream 6,000,000
Prism 3,000,000

= 102,5 million records sold

Just Dance 10,5 million
Poker Face 14 million
LoveGame 3,5 million
Paparazzi 5 million
Bad Romance 12 million
Telephone 9 million
Alejandro 5 million
Born This Way 9 million
Judas 2,5 million
The Edge Of Glory 5 million
You And I 2,5 million
Marry The Night 1 million
Applause 4 million
Do What U Want 2 million
Other songs = 6 million

(The Fame) Monster 16 million
Born This Way 7 million
ARTPOP 1,7 million
Cheek To Cheek 500,000+

= 116,2 million records sold

I thought Katy was more successful?

Ur receipts are very inflated

Because Gaga had one of the most impressive peaks in recent memory, which also happened to coincide with the peak of the digital market. At this pace, she'll outsell Gaga in her next era, whether it's a re-release or a full album.

Gaga had bigger peak but Katy is obviously going to outsell her next era. No problem.

Roar - 6,000,000+
Unconditionally - 500,000+
Dark Horse - 5,000,000+

Roar and Dark Horse are at 5.6 million in the US alone and Uncle is at 1.2 million in the US alone

screaming

Selling 2,5 million albums in less than a year is a dead career?

who's kety pery

so much inflation here....

NONE of them are above 100M

Add 5 million more on each yet she doesn't outsell her

I love Gags to death, but I really don't see the point.

To answer the question: Why? It has to be someone, and in this case it is Gaga. Might be different in the future.

Kids just don't have that much pocket money.