Watch: Shah Rukh Khan's Billo duet with Mika Singh at Karim Morani's party

Mumbai: Producer Karim Morani ringed in his birthday last night in the presence of his friends from the industry including Bollywood superstar Shah Rukh Khan and singer Mika Singh.

At the party, Mika entertained the guests and put up a great show by singing newly released song ‘Billo’from ‘Dishoom’. To everyone's surprise Shah Rukh joined Mika and was seen humming few lines.

Mika posted a video and wrote, “Happy ‪#‎birthday to ‪#‎kareemmorani. Had a great party, also the king of so many hearts ‪#‎shahrukhkhan sang ‪#‎Billo .."

On work front, Shah Rukh is gearing up for the release of Maneesh Sharma’s ‘Fan’. He will also be seen in Rahul Dholakia’s ‘Raees’ which is all set to clash with Salman Khan’s ‘Sultan’.

The last time the two superstars clashed at the box-office was in 2006, on the occasion of Diwali, where Salman's 'Jaan-e-Mann' failed to impress the audience while Shah Rukh's 'Don' was a hit.