It's usual today that celebrities appears in all types of ads, promoting several things like shampoos, make-up, clothes, etc.. The news is that banks use them also. It's a good marketing strategy to gain more clients, loans, or savings accounts.

An example is the TV Ad of BES (a portuguese bank) which used the Cristiano Ronaldo's transfer to Real Madrid to promote a saving account. You can see the TV Ad in the video below.