Lets See their popularity on Google Search trends in last 7 years.
We have written "Katrina kaif,Aishwarya rai" in search trends as shown below

This gives us graph as shown in picture given below.

This gives us graph as shown in picture given below.
As you can see in graph, Popularity graphs of both actresses are shown here. No need to explain any more , you will understand how katrina kaif has crossed popularity of ash after 2008.
You can also check more here like iphone vs Android, Angelina Jolie vs Megan Fox ,etc



