While people are eagerly anticipating his interview with Diane Sawyer later this week, in which the former track and field athlete is expected to speak up about his reported gender transition, Bruce Jenner has been spotted wearing a sports bra as he drove around on his motorcycle in Santa Monica.

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The Olympian and stepfather of Kourtney, Kim, Khloe and Rob Kardashian, was spotted on Sunday with what looked to be supportive underwear after several reports claimed that he had undergone breast enhancement surgery. 

As Bruce drove around Santa Monica, the outline of the sports bra can obviously be seen under his black jacket. He kept his face hidden under a black helmet and sported dark blue jeans and gray and green trainers.

The dad of supermodel Kendall and the face of Nip + Fab, Kylie, spent almost an hour driving around the beachfront city before going home.

It was previously reported that Bruce would use the name Belinda or Brigitte, though that has yet to be confirmed.

The reality star is expected to share the details of his gender change in his much-anticipated interview with Diane Sawyer which airs Friday.

In the latest promo, Bruce revealed that he is extremely concerned with his family and is putting them first amidst the news of his decision to transition from male to female.

Talking about his four stepchildren and six children, Bruce said in the short clip, "I can't let myself hurt them."

Bruce appears on the interview on a sofa, dressed in a blue long-sleeved shirt and black slacks and is seen supported by his children Brody, Brandon, Burt and Casey. According to numerous reports, Bruce will use this time to present himself as a woman for the first time.

TMZ reported that Bruce will start telling his story when he was simply five years old and will discuss the difficulties he's had to deal with living in the wrong body and how his decision has affected his family.

Some news outlets also claimed that Bruce will reveal himself as a transgender on KUWTK's finale on May 31.

Watch Bruce's interview with Diane Sawyer on April 24, Friday at 9 pm on ABC.

TagsBruce Jenner, Bruce Jenner Transgender, transgender, Gender Change, Diane Sawyer