We all know they're getting hitched tomorrow in front of about 250 guests. A source just told us that a rehearsal dinner is taking place tonight near the beach in Santa Monica.
And our source just revealed some more wedding-day details...
Khloé's sisters Kourtney and Kim are said to be maids of honor. Lamar's close friend and business partner, Jamie Sangouthai, is one of the best men.
Khloé's little sisters Kendall and Kylie Jenner are among the bridesmaids, as well as Khadijah Haqq, Malika Haqq and Lauren London.
Best man goes to Jerry De Gregorio. Groomsmen include Robert Davis, Alex Harris, Lester Knispel, Jeff Schwartz and the lone Kardashian brother, Rob Jr.
Our source also said the reception will include music from DJ Kid Capri, plus a surprise performance from a Grammy-winning musician.