BRUCE JENNER has taken the first steps in his quest to become a woman!

In the early morning hours of Jan. 19, the 64-year-old estranged husband of Kardashian matriarch Kris Jenner was spotted entering The Beverly Hills Surgical Center, where a source said he underwent a “laryngeal shave,” a procedure to soften the appearance of his Adam’s apple.

Although Bruce previously said he just didn’t like his trachea, a laryngeal shave is usually part of what experts call the facial feminization process prior to gender reassign­ment surgery. The source adds that Bruce – the 1976 Olympic decathlon champi­on – also had a consultation with famed plastic surgeon Dr. Stephen J. Pincus about making the transformation.

Recent ENQUIRER photos in our print edition reveal a long-haired Bruce had his jogging top zipped up to hide his bandages as he was escorted to a waiting Mercedes outside the physician’s Rodeo Drive office at around 10:30 a.m.

“The car took him back to his Malibu home, and he was told no talking for a few days,” said a family insider. “He was also told to stay off his feet for the rest of the day – to just take it easy and rest. But before Bruce had his Adam’s apple shaved down, he talked to the doctor at length about having his penis removed next.”

Dr. Sherman Leis, one of the nation’s foremost plastic surgeons specializing in this type of procedure who has not treated Jenner, told The ENQUIRER that after this “first step,” most patients begin hormone treatment to give them fuller, more feminine hips and breasts.

“The patient can develop anywhere from an A cup to a D cup within three months to a year,” said Dr. Leis, who has not treated Jenner. “In the meantime, we may do further facial feminization procedures if desired to soften the chin or restructure the nose to make these look more feminine.

“We also insist that a patient receives a year of mental health therapy and counseling to determine whether he is a true candidate for gender reassignment. If he clears both the mental and physical guidelines, we then perform bottom gender reassignment surgery.”

The source reveals that Bruce – who married Kris in 1991 and has two daughters with her, Kylie and Kendall – has already begun hormone therapy and is developing breasts.

“Bruce says he is finally doing what he wants to do,” the insider continued. “He knows he will be the butt of a ton of jokes, but he was tired of living his life to make other people happy.

“He says he may not get breast implants because he doesn’t want to embarrass his daughters. He’ll continue to look more like himself in public. He explained to his kids that life is too short not to be your true and authentic self.”