According to a Disney spokesperson, that Demi Lovato had a visit from good friend, Nick Jonas at her treatment facility. Also another celebrity friend who had visited her before was Miley Cyrus. There is no indications at this time of anyone else that has visited it her other than her family members.
(Please note, we just posted what sources have mentioned. We aren’t 100% sure if it’s true. But I thought to post this because it’s quite sweet if he did because they are good friends and we know that. So please don’t be rude.)