Alli has been keeping her personal life matters low and secret. Information related to her love affairs and boyfriend is unknown. She is still single. Her parents are happily married and there is no any sign of them getting divorced.
Alli's brother Cody Simpson is an Australian pop singer and he is her main inspiration to pursue her career in singing. She has also been supporting him personally. While she was in Australia, she began her career as an actress and model. To support her brothers singing career, she moved to Los Angeles. She is also known for being the model of the shoe brand Love Pastry. She is also a YouTube personality and has posted several singles in her YouTube channels. She has more than 8 million views in YouTube. Her net worth is expected to be high.