Aparnaa Bajpai was born to Ramesh and Sushma Bajpai, whilst she has two brothers Ashish and Arpit. Aparnaa did her schooling from St.Xaviers.Sr Sec School Chandigarh before going on to pursue college in Delhi, which she is currently taking a break from to complete professional assignments. She is currently situated in Chennai whilst filming for her Tamil films. Aparnaa's close friend is Disha Pandey, who has also recently made her debut in Tamil films.
Aparnaa began her career doing modelling and appearing in various commercials, including one for a soft drink with Aamir Khan. Noted director Sasikumar selected Aparnaa for a role in Easan after spotting her in such an advertisement. The film featured her opposite Vaibhav Reddy, as Reshma Shivaraj, a rich Kannada language college girl and unlike other actresses, Aparnaa dubbed for her role herself. The film opened in December 2010 to critical acclaim, with the ensemble cast being praised as "near-perfect", with Aparnaa's performance being described as "fabulous" by critics.
She will appear in a double role in her forthcoming film, Karuppampatti, opposite Ajmal, whilst she has also signed to be a part of Sasikumar's production venture, Thiru Nagar. Furthermore, she is also playing a lead role in the upcoming Telugu film, O Manasa.