Pratibha Patil was today sworn-in as the first woman President.She was administered the oath of office by Chief Justice of India K G Balakrishnan at a function in the Central Hall of Parliament House here.The function was attended by a host of VVIPs including outgoing President A P J Abdul Kalam, Prime Minister Manmohan Singh, Lok Sabha Speaker Somnath Chatterjee, Rajya Sabha Deputy Chairman K Rahman Khan, UPA chairperson Sonia Gandhi, former Prime Minister Atal Bihari Vajpayee, opposition leaders, Governors, Chief Ministers and members of the diplomatic corps.A 21-gun salute was accorded to Patil after she was sworn-in as the country's 13th President.