Caitlyn Jenner, 68, appears on Piers Morgan Life Stories tonight for an in-depth interview about her life so far.
Caitlyn was formally known as Bruce before making the transition into a woman in 2015.
She publicly announced her identity as a trans woman on the cover of the July 2015 issue of Vanity Fair and in an interview with Diane Sawyer in April 2015.
Jenner was well known in the USA as a gold medal winning athlete before finding a different kind of fame appearing on reality show “Keeping Up with the Kardashians”.
The programme followed Jenner’s daughters Kendall and Kylie, as well as ex-wife Kris and step-daughters Kim, Khloe and Kourtney.

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Years in the spotlight have brought Jenner considerable wealth, and according to bankrate.com, she is worth $100million (£73.8million).
Caitlyn’s fortune comes from sports accolades, book royalties and public appearances which Forbes estimates may earn her up to $100,000 (£73,000) a time.
There are also the earnings from television appearances.
Caitlyn’s appearance on Piers Morgan’s show tonight looks set to be heated, with Jenner slamming Morgan, 52, as “disrespectful” at one point.
The outspoken host held a male doll of Caitlyn resembling her time as Bruce. Pointing at the doll, Piers asked her: “How does your physique now compare to what it was like then? Obviously certain areas we know…”
Caitlyn interrupted and said: “See you made a comment there and that’s why you would get in trouble, ok?”
Piers pulled a puzzled face back at the star before Caitlyn continued: “You said ‘of certain areas,’ that to a trans person is disrespectful.”
Sounding confused, Piers asked: “Is it really, why?”
Caitlyn replied: “Because you don’t make a joke about that…Because it’s not funny.
“It’s life, it’s a part of my life and a very serious part of my life and I take that very seriously. And out of respect for myself and the community, it’s not something that you joke about.”
This is not the first British TV interview Caitlyn has given, appearing on This Morning last year.