If it happens then it will be a truly a very big and exciting casting coup of sorts when tinsel town`s Mr.Perfect Aamir Khan and World`s most gorgeous Aishwarya Rai Bachchan shares the screen space for the first time.

Buzz is that Karan Johar has managed to convince Aishwarya to say yes` to a movie under his banner, Dharma Productions. And it is said that the hotshot filmmaker is considering Aamir Khan to have as the hero.

While both Aamir and Aishwarya had earlier briefly worked together in Mela` for a scene or two and also for a soft drink ad, this will be first time the two stars will be seen together full-length, if all goes well.

Besides, never ever Aishwarya has worked with KJo, although her family members including parents-in-law Amitabh Bachchan and Jaya ji and hubby Abhishek were seen in his projects. In fact, the diva was supposed to do Dharma Productions` Dostana` but it didn`t work out. Well, we feel that this plan clicked during the recent SRK birthday party where KJo and Aishwarya were guests.

Incidentally, Karan wanted to have Aishwarya for his much talked project Shuddhi`. However, since the film has Salman Khan now, we can understand why this deal won`t work out...