Caitlyn Jenner then and now

Caitlyn Jenner attends the Life is Good at Gold Meets Golden Event at Equinox on in Los Angeles on Jan. 7, 2017.

From left, Madeline Albright, Caitlyn Jenner and Judith Light attend the 2015 Glamour Women of The Year Awards dinner hosted by Cindi Leive at The Rainbow Room in Manhattan on Monday, Nov. 9, 2015.

Honorees Reese Witherspoon, left, and Caitlyn Jenner attend the 2015 Glamour Women of The Year Awards dinner hosted by Cindi Leive at The Rainbow Room in Manhattan on Monday, Nov. 9, 2015.

Caitlyn Jenner, left, and Kylie Jenner backstage at the 2015 Glamour Women of The Year Awards dinner hosted by Cindi Leive at The Rainbow Room in Manhattan on Monday, Nov. 9, 2015.

Caitlyn Jenner at the 2015 Glamour Women of The Year Awards dinner hosted by Cindi Leive at The Rainbow Room in Manhattan on Monday, Nov. 9, 2015.

Honoree Caitlyn Jenner accepts the Arthur Ashe Courage Award onstage during The 2015 ESPYS at Microsoft Theater on July 15, 2015 in Los Angeles.

Honoree Caitlyn Jenner accepts the Arthur Ashe Courage Award onstage during The 2015 ESPYS at Microsoft Theater on July 15, 2015 in Los Angeles.

Honoree Caitlyn Jenner accepts the Arthur Ashe Courage Award onstage during The 2015 ESPYS at Microsoft Theater on July 15, 2015 in Los Angeles.

Bruce Jenner, a native of Mount Kisco, N.Y., celebrates his record-setting performance in the decathlon at the 1976 Summer Olympics in Montreal.

Bruce Jenner and his son-in-law, NBA player Lamar Odom, arrive at the 2012 ESPY Awards on July 11, 2012.

Bruce Jenner attends the 13th annual Michael Jordan Celebrity Invitational gala at the ARIA Resort & Casino at CityCenter in Las Vegas on April 4, 2014.

Bruce Jenner arrives for Ryan Sheckler's 7th annual Celebrity Golf Tournament at Trump National Golf Course in Palos Verdes Estates, California, on Sept. 29, 2014.