(Cover) - EN Showbiz - Nicole Richie has been working out religiously to prepare for her upcoming wedding, in what is being called a bridal boot camp regime.

The TV star is engaged to rocker Joel Madden, who she has two-year-old daughter Harlow and 14-month-old son Sparrow with. The pair have been secretive about their marriage plans, although it is thought they will wed at Nicoles father Lionel Richies home in Beverly Hills later this month.

Nicole has already had her bachelorette party in Mexico, and is now thought to be doing her best to get in shape for her big day. She has been on a juice cleanse, which she documented on social networking website Twitter, and has also been pumping iron.

For the past month, Richie has been spotted putting in some quality time at Tracy Anderson Method Studios in Studio City, Ca., reports RadarOnline.

Nicole has been completing a range of different exercises at the venue, including dancing, kicking and boxing. The studio is a favourite among celebs including Courteney Cox Arquette and Gwyneth Paltrow.

Although details of the ceremony are scarce, it is thought Harlow will be a flower girl and Samantha Ronson and Christina Aguilera will be in attendance.

Christmas has always been about family and faith for Nicole and Joel, so there is no better time of the year for them to wed, a source told the site. (C) Cover Media