Saif Ali Khan at the Set of 'Ra.One' in London

First Shahrukh Khan couldn't stop tweeting about his upcoming movie Ra.One, sharing inside info about the Anubhav Sinha directed hero action flick that also stars Kareena Kapoor. And now it's Karan Johar's turn to dish on the details from the set in London!

The popular movie producer took to Twitter to talk about the production that is underway and he even shared some twitpics, including a few of Kareena Kapoor's beau, Saif Ali Khan, who came to visit his belle in the British capital:

Dostana!!!

The glamorous couple!!!

Trying my hand at photography!!!

When SRK is not busy hanging out with KJo, he tweets to fans and followers about what else is going on the star-studded set:

wore lungi for a scene.it kind of gets windy & cool inside after a while coupled with the fear that it may open.tense & relaxed coexistence.

onto dinner i proceed. then bathe, say my prayers & wake up to a new day with hope & belief. have a good nite or day as per ur longitude.

just finished the shooting..have a turnaround day off tom...will have to sleep off the excessive work. mentally tired..love u all...chat tom

Sounds like SRK, KJo, Bebo and Saif are having a good time on the set of Ra.One! We can't wait for this one to hit theaters! How about you?