Miley Cyrus is a well-known and in-demand performer, so her fees for private events are likely to be very high. In addition, Cyrus' schedule is likely to be quite busy with her own tours, recording sessions, and other professional commitments. This means that finding a date and time that works for her could be a challenge.
If you are interested in hiring Miley Cyrus for a private birthday party, it is best to contact her agents or management team directly to inquire about her availability and fees. Be prepared to provide details about the date, time, and location of the event, as well as the number of guests and the budget available. You should also be prepared to negotiate with Cyrus' team to reach an agreement that works for both parties.