updated 09/22/2010 AT 12:00 PM ET
•originally published 09/22/2010 AT 1:00 PM ET
Here comes the bride-to-be!
Though Nicole Richie and Joel Madden have yet to announce a date for their wedding – in June the rocker told PEOPLE, “we haven’t even started planning” – it looks like they’re getting closer to their big day.
Last weekend, the mother of two, who turned 29 on Monday, and several of her friends – including Christina Aguilera and Samantha Ronson, stylist Simone Harouche and hair stylist Andy LeCompte – headed to a luxury resort in Cabo San Lucas, Mexico, for her bachelorette party.
How wild did it get? In the daylight hours, at least, a bikini-clad Richie spent a lot of time relaxing by the Las Ventanas pool, and also enjoyed spa treatments, including manicures and pedicures, according to a source. The friends also shared a group dinner one night, where they toasted with margaritas.
The group commemorated the event with customized T-shirts.