Joe Jonas — On His Own In L.A.

With the future of the Jonas Brothers in peril … and a big decision looming … Joe Jonas ventured out alone today — rollin” solo in L.A.

As we”ve reported … Joe, Nick and Kevin are deeply divided musically and are expected to decide the fate of the band this weekend — whether they”ll stay together … or go their separate ways.

24-year-old Joe — the middle brother — hit up SoHo House in West Hollywood this afternoon … sans brothers.

Maybe he”s trying it on for size.