Washington, Mar 21 : American singer Jennifer Hudson left the cast of Sex and the City dumbfounded when she serenaded them with her incredible voice.

Hollywood Actress Cynthia Nixon revealed that the flick cast would often indulge in impromptu sing-a-longs to pass the time during takes.

However, Sarah Jessica Parker, Kristin Davis and Kim Cattrall were all ears when Hudson came on board for a featured role in the 2008 blockbuster, as they were dazed with her powerful vocals.

"You get pretty punch drunk at that point. We sing a lot of show tunes... it was so amazing when we did the film we had Jennifer Hudson on the set and sometimes she would sing for us. That was a treat," Contactmusic quoted Cynthia as saying. (ANI)