Article continues below advertisementAmanda Bynes is teasing new music. Taking to Instagram on Sunday, January 18, the troubled child star first uploaded a photo of herself posing with artist SinceWhen. Both brandished $100 bills in the snap, which she captioned, "Love u @sincewhen." In a follow-up post, she shared a preview of a song she's been working on, in which she could be heard singing, "I want to be your girlfriend." The Nickelodeon alum, 39, wrote, "Cooking up in the studio. Want this to be a dance trance edm track. We'll see where we go with it.