"I have never been more proud of Bruce for who he is, himself as a father, as an Olympian, a wonderful public speaker. He instills enthusiasm in people. He's gifted."
She added that she was unaware of his wishes until very recently, but commented further that she is right behind him through his journey.
"I support him whole-heartedly. I just love him like I always have," she revealed.
MailOnline has contacted a representative for Bruce Jenner and is awaiting comment.
However, this isn't the first time the 88-year-old has addressed Bruce's appearance and gender change.
Speaking exclusively to MailOnline in November, following his divorce from wife Kris, she said:
"I love him, no matter what. There's such raunchy publicity all the time. I don't know. I've brought this up to him on the phone when we've talked and he says 'mum you can't believe this stuff', he said you can't pay any attention to this stuff and I said 'well I want to tell you one thing Bruce, I don't care if what they're putting out is true or false, it's not going to change my love for you', and it's true that's exactly how I feel, but I don't like it."
She did hold a frank opinion on his long mane of hair though: "I hate his hair, I tell him it's ugly. That it's ridiculous.
"I told him on the phone the other day, we were talking about it and I said 'you know Bruce, you just turned 65 and you're wearing you're hair like you're a teenage rebel'. He laughed, just cracked up, he doesn't pay any attention to me. He's always been single-minded and independent."
The news of his mother's apparent confirmation comes after reports claimed he would be taking part in an exclusive tell-all interview with Diane Sawyer, to discuss his intentions to live as a woman.
Previously, it was alleged that Kris Jenner "freaked out" over his alleged plan to change his gender.
However, as well as being supported by his mum, it appears that he actually has the full support of his entire family over the big change.
According to a Sunday report from People magazine, all the 65-year-old former Olympian's kids and even ex wife Kris all approve of his choice to live life as a female.
A source for the weekly said: "The number one thing is they all support Bruce.
"Kris has been great and anything that says the opposite just isn't true. It's really a hard adjustment for her and a shock but she 100% supports him - the whole family does"
On Saturday, TMZ reported that Kris "freaked out" when Bruce broke the news to his family.
People's insider also claimed that not all of Bruce's children knew about his plans until recently: "There was a lot they didn't know about their dad."
The former gold medallist's big decision was confirmed by the same publication on Friday as a source claimed: "Bruce is transitioning to a woman.
"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."
The reality star has been pictured in recent days with manicured nails, smooth legs, longer locks and what appeared to be fuller lips.
A different source for People confirmed that Bruce is also filming a docu-series of the transition to air on E! later this year.
Stepdaughter Kim hinted at Bruce's transition last week when she told Entertainment Tonight: "I think everyone goes through things in life, and I think that story and what Bruce is going through, I think he'll share whenever the time is right."
She added: "I think Bruce is very happy, the happiest I've ever seen him. Of course we support Bruce 100 percent."
"I guess I'll kind of let everyone be curious and I feel like that's his journey to talk about, I just think it's his story to talk about, not really mine."
Bruce has six children from his three marriages - daughters Kendall, 19, and Kylie, 17, with Kris Jenner; sons Brandon, 33 and Brody, 31, with ex-wife Linda Thompson; and daughter Cassandra, 34, and son Burt, 36, with ex-wife Chrystie Crownover.
And he has four stepchildren from his marriage to Kris: Kourtney, 35, Kim, 34, Khloe, 30, and Rob, 27.
- Daily Mail
