A 'secret' role had Hrithik Roshan flying in to Berlin for Farhan Akhtar's next Hrithik Roshan flew off last night to Berlin for a hush-hush shoot the film in question being Farhan Akhtar's Don 2 - The Chase Continues.

Says a source, "Recently, there was buzz about Hrithik joining in Shah Rukh Khan's birthday celebrations as he's extremely close to King Khan.

While that may be true, the real reason for Duggu's departure to Berlin is being kept under wraps. Apparently, producers Farhan Akhtar and Ritesh Sidhwani were keen that Hrithik do a special cameo in Don 2."

Adds the source, "Roshan's character is a stylised one with interesting shades and they felt only he could do justice to it. But Farhan and Ritesh want to keep Hrithik's role hidden till the film's release as it's one of the highlights of Don 2.

Duggu is very close to Farhan and Ritesh (he acted in Farhan's Lakshya, made a special appearance in Zoya Akhtar's Luck By Chance and is also in Zoya's next Zindagi Na Milegi Dobaara) and he couldn't refuse them."

Besides the character, the source insists that the Roshan boy's presence would add star-studded value to the film. "Hrithik and Shah Rukh will come together again in Don 2 after Karan Johar's Kabhi Khushi Kabhi Gham. They shared an amazing chemistry and are close friends even today.

The audience would love to see SRK and Hrithik again come together in some explosive scenes. Don 2 has highly specialised and daring stunts performed by Shah Rukh and Duggu might be seen in a stunt or two himself. He will be in Berlin for a week."

Hrithik and Ritesh remained unavailable for comment.

Besides SRK, Lara Dutta, Boman Irani, Kunal Kapoor and Priyanka Chopra are also in Don 2.