instruction: When did Alia Bhatt get her first leading role?
context: Alia Bhatt (/ˈɑːliə ˈbʌt/; born 15 March 1993) is a British actress of Indian descent who predominantly works in Hindi films. She has received several accolades including four Filmfare Awards. One of India's highest-paid actresses, she has appeared in Forbes India's Celebrity 100 list since 2014 and was awarded the TIME100 Impact Award in 2022.
  
  Born into the Bhatt family, she is the daughter of filmmaker Mahesh Bhatt and actress Soni Razdan. After making her acting debut as a child in the 1999 thriller Sangharsh, she played her first leading role in Karan Johar's teen film Student of the Year (2012). She won the Filmfare Critics Award for Best Actress for playing a kidnapping victim in the road drama Highway (2014), and went on to establish herself with starring roles in several romantic films produced by Johar's studio Dharma Productions as well as the coming-of-age drama Dear Zindagi (2016).
response: Alia Bhatt received her first leading role in 2012, in the teen film Student of the Year.