Khloe K. -- Laker? They Hardly Know Her!

Kobe Bryant will be front and center at the Lamar Odom/Khloe Kardashian nuptials this Sunday ... which means Vanessa and her $4 million ring may have a few pointers for the bride.

In fact, Lamar's rep tells TMZ all the players are planning to attend, but there are still a few question marks. Several have not RSVP'd -- Pau Gasol, Andrew Bynum and Jordan Farmar.

Can't blame the non-committals ... it is last minute, after all.