Court is back in session … and Luigi just pulled the ultimate comeback … showing up so polished and glowing, you’d never believe this was the same guy who looked rough AF a few days ago.

There was zero hint of Monday blues for Luigi on Day 4 in NYC … he rolled in looking ridiculously sharp, fully suited and booted, and serving smolder so hard he could’ve been a male model in a different life.

Whatever bug he had, it’s clearly gone — Luigi’s back on his feet and looking alarmingly refreshed for a guy fighting both state and federal first-degree murder charges

As you know, it was a whole different story last week — Judge Gregory Carro said Mangione had fallen ill, putting the case on ice Friday. We even caught LM’s defense team slipping out of the courthouse … and they too were totally mum about what was going on with him.