Lauren Conrad is celebrating her bachelorette party in Mexico.

The former 'The Hills' star, who is set to marry fiancé William Tell in her native Orange County, California this summer, flew to Cabo San Lucas with a few of her closest female friends, including former co-star Lo Bosworth and DJ Jilly Hendrix, for a long-weekend of pre-wedding festivities.

The 28-year-old fashion designer shared a photograph via Instagram on Thursday evening (19.06.14), showing a line of colourful streamers against a gorgeous ocean background, with the caption: ''Let the games begin #donttellmrtell (sic)''

She also posted a photo this morning (20.06.14) of a pink cookie shaped like a diamond engagement ring, with the words, ''Lauren's Bachelorette,'' iced around the edge.

Lauren - whose former co-star Whitney Port is also getting married this summer - previously hinted most of her old cast-mates wouldn'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.''

Lauren, who got engaged in October, has been heavily involved in planning her big day and is rumoured to have designed her own wedding dress.

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