Jennifer Aniston has a shape most women would die for, but even she feels insecure when compared to a swimsuit model! The 41-year-old actress is currently shooting “Just Go with It” in Hawaii, and one of her co-stars is 2010 SI Swimsuit Issue cover girl Brooklyn Decker. Now sources report that Jen is stepping up her own fitness routine to compete with the much-younger hottie.

“Jen has been getting really wound up with the wardrobe department because her costumes are so skimpy and she’s worried about working with a younger model with a hot body. She has upped her fitness regime and has had her gym equipment sent to her villa.” A movie with two bikini-ready babes in revealing outfits sounds like a must-see for us!