MLB Star Justin Upton — BALLER WEDDING … With Celebrity Wedding Singer

EXCLUSIVE

San Diego Padres superstar Justin Upton is officially a married man — and the have fun was INSANE … TMZ Sports has learned.

The 27-year-ancient superstar (who’s finishing up a $ 50 million contract) tied the knot to longtime GF Ashley Borror Saturday night at a fancy L.A. hotel and spared no expense.

The bar? Top shelf booze … the well scotch was Macallan 18!
The smokes? Guy had a box of Cubans for anyone who wanted to puff away.
The entertainment? BRIAN MCKNIGHT … and we’re told he KILLED IT!

Tons of well-known people were at the event … including Justin’s baseball star brother BJ Upton and Justin’s ex-teammate Dan Uggla.

Mazel!