Question: What actress-comedian in Aap Ki Khatir is also a playback singer?

Context paragraphs:
For Pete's Sake (film): For Pete's Sake is a 1974 American screwball comedy film directed by Peter Yates.  The screenplay by Stanley Shapiro and Maurice Richlin chronicles the misadventures of a Brooklyn housewife.  In 1977 it was remade in India as the Hindi film "Aap Ki Khatir".

Aap Ki Khatir (1977 film): Aap Ki Khatir ("for your sake") is a 1977 Bollywood film, Harsh Kohli produced and Sudhendu Roy directed the film.  The stars are Vinod Khanna, Rekha, Nadira, Helen, Tun Tun and Om Shivpuri.  The film's music is by Bappi Lahiri.  The last song in the film "Bombay se Aaya Mera Dost" became a memorable hit.  The film is a remake of the American film "For Pete's Sake" (1974) starring Barbra Streisand.

Aulad Ki Khatir: Aulad Ki Khatir (Hindi: औलाद की खातिर) is a 1990 Bollywood film starring Mohan Choti, Deep Dhillon and Swapna in lead roles.

Aap Ki Kasam: "Aap Ki Kasam" (I swear by you) is a 1974 Indian Hindi romance film produced by J. Om Prakash, which also marks his directorial debut.  The film stars Rajesh Khanna, Mumtaz, Sanjeev Kumar, Rehman, Asrani and A. K. Hangal.  The music is by R.D. Burman, who received the only Filmfare nomination for the film.  The film was successful and was declared as hit on the box office, and it was also acclaimed by the critics.  The songs from the film, including 'Jai Jai Shiv Shankar', 'Zindagi ke safar mein' and 'Karvate badalate rahen', became very popular.

Ganesh Jain: Ganesh Jain is a Bollywood film producer.  He, along with his brothers, Ratan Jain, Girish Jain, Champak Jain, Umed Jain, Ramesh Jain and Bhawar Jain, founded the company Venus Records & Tapes .  Major films he has produced include "Baazigar", "Josh", "Garam Masala" and "Aap ki khatir".  He was elected as chairman of the Indian Music Industry (IMI) and Indian Phonographic Industry (IPI) for the year 2012–2013.

The Wedding Date: The Wedding Date is a 2005 American romantic comedy film directed by Clare Kilner and starring Debra Messing, Dermot Mulroney, and Amy Adams.  Based on the novel "Asking for Trouble" by Elizabeth Young, the film is about a single woman who hires a male escort to pose as her boyfriend at her sister's wedding in order to dupe her ex-fiancé, who dumped her a few years prior.  The release was successful, achieving $47 million worldwide at the box office against a budget of $15 million, despite being panned by critics.  It was remade in Bollywood as "Aap Ki Khatir" which also performed well at box office.

Aap Ki Khatir: Aap Ki Khatir is a term in Hindi meaning "just for your sake".  It is the title of three Hindi movies :

Aap Ki Marzi: Aap Ki Marzi (As You Please) is 1939 Hindi romantic comedy film directed by Sarvottam Badami.  The film was produced under the Sudama Productions banner.  The music composer was Gyan Dutt with lyrics credited to Pyare Lal Santoshi and S. P. Kalla.  It starred Motilal, Sabita Devi, Khursheed, K. N. Singh, Mazhar Khan, Vasanti and Sunalini Devi.  This was director Badami's second comedy film; he had earlier directed the comedy "Teen Sau Din Ke Baad" (1938) which turned out be a box office success.  "Aap Ki Marzi" was based on the MGM produced, Edward Buzzell directed film "Paradise for Three" (1938) from Erich Kastner's novel.

Aap Ki Khatir (2006 film): Aap Ki Khatir (Hindi: आप की ख़ातिर, Urdu:, آپ کی خاطر, English: For Your Sake ) is an Indian Hindi romantic comedy film directed by Dharmesh Darshan, starring Akshaye Khanna and Priyanka Chopra in lead roles.  It also stars Ameesha Patel, Dino Morea, Sunil Shetty and Anupam Kher.  It is based on the hustler 2005 Hollywood movie "The Wedding Date".  It was released throughout India and internationally in late August 2006.

Tun Tun: Tun Tun (11 July 1923 – 24 November 2003) was the screen name of Indian playback singer and actress-comedian, Uma Devi Khatri, who was called "Hindi cinema's first-ever comedienne".

Supporting paragraphs: Aap Ki Khatir (1977 film) Tun Tun
Answer: Tun Tun