The 21-year-old won the sixth season of the talent show when Lopez was not a judge but when she was recently told that Lopez is returning for a second season, she was happy to hear the news.
She said to In Touch: 'Oh, she is? Good! I didn't know! I've been so busy, I haven't been able to keep up!'
Recent reports claimed that Lopez, who recently split from husband Marc Anthony, will return as a judge after winning praise for her role on the last season.
Sparks added: 'I think she does a really good job. She's really sweet, but she's firm at the same time, which is good!'