Actor Ayushmann Khurrana, who will make a cameo appearance in the forthcoming film "Tumhari Sulu", has praised actress Vidya Balan, calling her a star performer."It was my pleasure to share screen space with Vidya Balan. She39s such a star performer. And you39re a superstar," Ayushmann tweeted on Wednesday. The film39s co-producer Atul Kasbekar said he was grateful to "the wonderful Ayushmann for doing a special appearance in our 39Tumhari Sulu39". "Thank you brother for being the nice man you are," Kasbekar tweeted. The story of "Tumhari Sulu" revolves around a middle-aged housewife Sulochona aka Sulu who is a happy-go-lucky person with an extraordinary calibre.Directed by Suresh Triveni, the film will release on November 17,