Sources close to the Kardashian-Jenner family have claimed Bruce Jenner is transitioning from male to female. This would certainly account for the speculation surrounding Jenner's changing physical appearance over the last couple of years and, although the family are yet to confirm Jenner's life choice, Jenner is allegedly willing to share his transition with the world in an upcoming E! documentary series.

Bruce Jenner
Bruce Jenner's alleged transition will reportedly feature on an E! documentary series.

Read More: Sources Reported To Have Confirmed Bruce Jenner Is "Transitioning Into A Woman".

People broke the news of 65-year-old Jenner's alleged transition. A number of sources close to the family have confirmed Jenner "is transitioning to female" and it is a decision he is happy with and receiving support from his family. "He is finally happy and his family is accepting of what he's doing. He's in such a great space. That's why it's the perfect time to do something like this," a source told the entertainment website. 

Jenner may not be willing to share the news with the wider world just yet but he is reportedly documenting his personal journey. The series, as a source told E!, "will air when he [Jenner] is ready to be open about his transition." 

The series will be aired on E!, which is the home of Keeping Up With the Kardashians and the assorted Kardashian spin-off series. According to Variety, E! is currently developing the series and the format but is working closely with GLAAD to ensure Jenner's transition is appropriately handled. 

Jenner's step-daughter, Kim Kardashian, may have indirectly referred to Jenner's life change and new reality series earlier this week. "Bruce should tell his story his way. I think everyone goes through things in life, but I do think that that story and what Bruce is going through, I think he'll share whenever the time is right," Kardashian said whilst speaking to Entertainment Tonight

Read More: Kim Kardashian Addresses Bruce Jenner's Changing Appearance: "He Is The Happiest I've Ever Seen Him".

Kris and Bruce Jenner
Bruce Jenner with his ex-wife Kris Jenner, photographed in April 2014.