After a month of dating, Khloe and Lamar are tying the knot this coming Sunday in Los Angeles.

Guests have only been notified through phone because of the sudden announcement. The formal invitations will be sent this week.

The couple went ring shopping during the weekend, as reported by E! News. Khloe found a ring that she liked and Lamar bought it on the spot.

The 25-year-old reality star and the 29-year-old NBA player met last summer. They have dated for a month and was engaged last week.