Khloe Kardashian says getting pregnant is "much harder" than she thought.

The socialite and her basketball player husband Lamar Odom have been trying for a baby but haven't had any success so far.

However, the brunette beauty isn't too disheartened because she enjoys the "practice".

Khloe, who this week celebrated their first wedding anniversary, told Life and Style magazine: "I thought I'd be pregnant by now. We've been working at it all year.

"Getting pregnant is much harder than we thought - but practicing making babies is amazing!"

The couple have reportedly started using a fertility monitor so they know when Khloe is ovulating and what the optimum time is to try.

A source said: "Khloe's been using the monitor for about a month now. They're trying more actively than ever before. Lamar is very serious about it."

Khloe, 26, and Lamar, 30, marked their anniversary by renewing their wedding vows on Monday (27.09.10).

The Los Angeles Lakers basketball player organised surprised his wife by organising a service at music industry executive Irving Azoff's family home in Beverly Hills - the location of their first nuptials.