30+ Jessica Biel fantastics "Bikini" Butt & Ass in Puerto Rico

Clearly in fine form, Jessica is well known for being a dedicated gym bunny, and even she admits she is 'boring' as she keeps to a strict routine.

The actress is in Puerto Rico with her fiancé Justin Timberlake, 31, who's in town with the crew of his new movie, Runner, Runner.

How many squats to get a butt like that? Jessica revealed she is very boring... and gives alcohol a miss as part of her strict health and fitness regime (Read more and See more Pictures)