Bruce Jenner reportedly has a new secret obsession: spanx. According to OK! Magazine the "Keeping Up With the Kardashians" star likes to wear slimming garments underneath his clothes to help hide any unwanted bulges.

A source told the magazine that Jenner wanted to keep his obsession a secret because of past rumors that he was becoming a woman.

"He started wearing them under his suits on the red carpet, and he loved the results so much that now he wears them all the time," the source claims.

Reportedly, the former Olympian is a little embarrassed about wearing spanx and was upset when Kris Jenner found out and told their daughters, Kylie and Kendall.

"The girls haven't stopped laughing, and Bruce was furious that Kris revealed something so private, especially with all the cross-dressing rumors," the source told OK!. "He insists the Spanx are just to hide his belly - not an excuse to wear women's underwear."

While it may seem a bit odd for a man to wear Spanx, the company does have a men's line and Jenner isn't the only celebrity man to admit to wearing them. According to HuffPost Live, "Project Runway's Tim Gunn his red carpet secret weapon is Spanx.

"As a man, even I wear it occasionally," he said. "Because everything just looks a little more fit, and slim, and trim."

Apparently Brad Pitt is also a fan. According to Perez Hilton, sources revealed that the actor will sometimes slip on a pair "to control [and to] minimize the bad and accent the good." The source told OK! that Jenner's new-found-love for Spanx could be less about the reality star trying to change his sex and more about body issues.

"Bruce beats himself up for not having washboard abs he had as a pro athlete," the source said. "He wants people to think that he's still ripped."