Will Monday Be JT's Lucky Day?

A little advice: Don't go gambling in Las Vegas on Monday, because Justin Timberlake is going to need all the luck in Sin City if he's going to succeed in Callaway Golf's Million Dollar Diablo Shootout.

The golf-crazy star sunk a hole-in-one back in July — and now he's going to try and do it again... in just three attempts.

If he makes it, club-makers Callaway will donate $1 million to Shriners Hospitals for Children, an international chain of 22 pediatric hospitals.

Good luck JT!