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Nicole Richie 'so excited' for sister Sofia to become a mother. The actress/fashion designer has said she is "so excited" for her younger sister Sofia, who recently announced that she is expecting her first child. Nicole also recently became an aunt to her brother-in-law Benji Madden and his wife Cameron Diaz's second child, named Cardinal, who they welcomed in March. Nicole joked in a recent interview with Extra, "What I should do is I should just get a tattoo and be like, 'I am the best auntie,' and just, like, have that, you know?”. The Simple Life star, 42, then recalled her first and last babysitting job. ”I was 16 (and) Britney Spears' album just came out...(The girl I was babysitting) loved Britney Spears also and she just, like, performed the whole album for me.” "So, I think I asked her to do it again and so she did a few times and the mom came home and I was like, 'This was easy - see you next time!' And then there wasn't a next time. I never got called back.”. In January, Sofia, 25, revealed in an interview with Vogue that she and husband Elliot Grainge, 30, are expecting a baby girl. Shortly after Sofia revealed the news, her father Lionel Richie admitted that he was "freaked" out. ”I'm watching my baby having a baby. Yikes! I mean, that just kind of freaked me out a little bit. But at the same time, Elliot and Sofia are such a force.” THIS VIDEO MUST NOT BE EDITED FOR LENGTH TO COMBINE WITH OTHER CONTENT