Joe Jonas runs into former costar MDot Finley at the Roosevelt Hotel in Hollywood on Wednesday night (July 18).

The 22-year-old musician actually just returned from filming The Next: Fame Is At your Doorstep in Baltimore to help MDot celebrate his ‘birthday month.’

“It’s something that I’ve always wanted to do, be able to mentor musicians,” Joe recently told us about the upcoming reality show. “To work with someone that’s in the same genre of pop music and be able to help them towards their career is really exciting!

10+ pics inside…