Lauren Conrad is only inviting ''close friends'' to her wedding.

The former 'The Hills' star is set to marry fiancé William Tell this summer but hinted most of her co-stars won't be at her nuptials.

She said: ''If we haven't sat down and had a meal together in the past two years, you're probably not going to be invited.''

One cast member that will be at her wedding is Lo Bosworth, who went to high school with Lauren.

She said: ''All of our close friends will be there. Everybody's really excited.''

The fashion designer wants her wedding day to be perfect and has embarked on a strict diet to ensure she looks her best.

An insider said: ''She's very involved in the details. She's known for entertaining, and she wants the day to be perfect.

''Picking out a dress has been the most fun for Lauren.''

The blonde beauty, 28, admits she is trying to stick to healthy meals ahead of her big day.

She told Us Weekly magazine: ''I like swapping ingredients and trying to make delicious meals a little healthier.''

Lauren and Will have also started hiking together.

She said: ''It's my favourite thing to do.''