Oscar De La Hoya is obviously feeling great after his COVID hospital stay -- some 7 days after the fact, he was putting his lungs to good use ... with some movie-themed karaoke.
The boxing champ was out in Pasadena this past Wednesday, hitting a place called the Der Wolf bar for some evening time showtunes ... where he got on the mic to sing "Shallow" -- yes, the Lady Gaga song from 'A Star is Born.'
In video obtained by TMZ, you can see ODLH reading lyrics off the monitor and belting out the second verse (Gaga's part) .