How much is it for Justin Bieber to play at a party?

As a virtual assistant, I don't have access to real-time pricing for music performances or celebrities' fees. Please note that prices can vary significantly based on factors such as the event type, location, duration of the performance, availability, and other agreements between booking parties and the artist's management.

Additionally, celebrities and their representatives generally handle and negotiate performance fees on a case-by-case basis. For accurate and up-to-date information, I recommend contacting Justin Bieber's official management or booking agency to inquire about fees for private performances. They will be able to provide you with specific details and options within their current terms and conditions.