It's a Miracle -- Billy B Back at Miss USA!

Hold the phone!!! Billy Bush has made a last second recovery and is back in as host of the Miss USA pageant.

As we first told you (just a few hours ago), Billy bowed out because of a stomach bug and Mark Walberg (not that one) stepped in. In fact, Walberg even rehearsed this morning for Sunday's show.

But alas, pageant officials got a call this morning that Billy was feeling much better and was on his way to Las Vegas to resume his hosting duties.

Pepto does it again.