Big B's native language is Hindi and Punjabi. He fluently speaks in Hindi, English, Urdu, Punjabi. He knows some bits of Bengali in addition too!
Deepika Padukone
DP is fluent in many languages. Her mother tongue is Konkani. She can talk in Hindi, English and Tulu. For Piku she gathered knowledge about Bengali as well
Salman Khan
Salman Khan speaks in Hindi, English. He is also fluent in Marathi as well, Salman's family shares a marathi connection as his mother Salma is Maharashtrian.
Shah Rukh Khan
The king of Bollywood, SRK can speak 4 languages fluently. These include Hindi, English, Urdu and Kannada and Pashto is his mother tongue
Akshay Kumar
Khiladi Kumar speaks Hindi, English, Punjabi and a bit of Gujarati to communicate with his personal assistant
Rajinikanth
The south superstar is fluent in six major languages that are hindi, English, Marathi, Tamil, Telegu and Kannada
Asin
You wont' believe but, The 'Ghajini' actress can talk easily in seven languages comprising Hindi, Tamil, Telugu, Malayalam, English, Italian and French