Jay-Z, Mark Wahlberg Give Love to Kobe Bryant, 'It's Just Tragic'

The biggest stars in the world -- from all walks of life -- are mourning the death of Kobe Bryant ... from Mark Wahlberg to Jay-Z, The Game, Lil' Kim and more. Of course, everyone happened to be in L.A. for the Grammys ... but Kobe was clearly on…