Bollywood actress Rani Mukerji on Monday said the time she has spent being a mother so far is the happiest period of her life.Rani is married to filmmaker Aditya Chopra. They have a daughter, Adira, who was born in 2015.In a Facebook chat, ahead of her birthday on Tuesday, Rani answered a bevy of questions from her fans.When asked how it feels to be a mother, she said: "It feels great. The last two and a half years -- nine months of pregnancy and one and a half years of motherhood -- have been the happiest years of my life. I enjoy seeing Adira grow, reach new milestones each day."Rani added that there's nothing more important for a woman than being a mother.She also said life has started anew post Adira's birth."It's amazing being a mother; you change overnight because the experience teaches you on a daily basis. I have become stronger and I have also mellowed down. But a lot of things come with being a mother. I'm looking forward to my journey of raising Adira, so it's going to be fun," she said.Asked why she isn't present on social media, Rani said, "I'm not on social media. I don't post pictures of my daughter because my husband is a very private person and I respect that. Also, I don't like saying no to my fans, especially when they ask me to post pictures."Last seen in 2014 action-thriller "Mardaani", Rani said she will next be seen in "Hichki", and the project will kick-off in April.Asked about her birthday plans, she said she will spend it at home with her daughter and husband.