Shah Rukh Khan is happy with his RA.One co-star Kareena Kapoor's work in his home production and has praised her sincerity in completing the shoot on time.

"Finished the last few bits and pieces of RA.One with Kareena. Want to thank her for working so hard and fast...she was such a sport. Hope we haven't tanned her too much in the hot sun, " Shah Rukh posted on his Twitter page.