PARK CITY, UTAH - JANUARY 23: Taylor Swift attends the 2020 Sundance Film Festival - "Miss Americana" Premiere at Eccles Center Theatre on January 23, 2020 in Park City, Utah. Credit: Neilson Barnard/Getty Images

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Taylor Swift premiered her revealing doc “Miss Americana.” Here’s how she surprised fans

Director Lana Wilson and Taylor Swift at the Sundance Film Festival 2020

Taylor Swift attends the 2020 Sundance Film Festival, where the documentary “Miss Americana” premiered at the Eccles Center Theatre on Jan. 23, 2020, in Park City, Utah. (Neilson Barnard / Getty Images)

Taylor Swift attends the 2020 Sundance Film Festival “Miss Americana” pemiere at Eccles Center Theatre. (Neilson Barnard / Getty Images)

Taylor Swift Arrives at Eccles Theater for the ’Miss Americana' premiere at the Sundance Film Festival, Park City, Utah Jan 23, 2020. Credit: Alberto Reyes/Shutterstock

Taylor Swift takes a selfie with fans at the Eccles Theater for the “Miss Americana” premiere at the 2020 Sundance Film Festival. (Alberto Reyes / Shutterstock)

The cameras and phones were out in force for Taylor Swift’s arrival at the “Miss Americana” premiere at the 2020 Sundance Film Festival. (Alberto Reyes / Shutterstock)

PARK CITY, UTAH - JANUARY 23: Taylor Swift attends the 2020 Sundance Film Festival Premier of "Miss Americana" at Eccles Center Theatre on January 23, 2020 in Park City, Utah. Credit: Neilson Barnard/Getty Images

Taylor Swift attends the 2020 Sundance Film Festival premiere of “Miss Americana” at Eccles Center Theatre. (Neilson Barnard / Getty Images)

Four family members show off pictures they took with Taylor Swift, after the singer arrived for the premier of her movie, 'Miss Americana' during the 2020 Sundance Film Festival in Park City, Utah, USA, 23 January 2020. The festival runs from the 22 January to 02 February 2020. Credit: GEORGE FREY/EPA-EFE/Shutterstock

Four family members show off pictures they took with Taylor Swift at the premiere of documentary “Miss Americana” at the 2020 Sundance Film Festival in Park City, Utah. (George Frey / EPA-EFE/Shutterstock)

Taylor Swift attends the 2020 Sundance Film Festival’s opening-night premiere of her documentary “Miss Americana” at Eccles Center Theatre. (Neilson Barnard / Getty Images)

Several Taylor Swift fans wait in the cold, hoping to get a glimpse of Swift when she arrives, at the premier of her movie 'Miss Americana' at the 2020 Sundance Film Festival in Park City, Utah, USA, 23 January 2020. Credit: GEORGE FREY/EPA-EFE/Shutterstock

Several Taylor Swift fans wait in the cold, hoping to get a glimpse of Swift when she arrives at the premiere of her movie “Miss Americana” at the 2020 Sundance Film Festival. (George Frey / EPA-EFE/Shutterstock)

(L-R)- Christine O'Malley, Caitrin Rogers, Lana Wilson, Taylor Swift, Morgan Neville and guest arrive at the ’Miss Americana' film premiere at the Sundance Film Festival, Park City, Utah Jan 23, 2020. Credit: Michael Hurcomb/Shutterstock

Christine O’Malley, left, Caitrin Rogers, a guest, Lana Wilson, Taylor Swift and Morgan Neville arrive at the “Miss Americana” film premiere at the Sundance Film Festival. (Michael Hurcomb / Shutterstock)

(L-R)- Lana Wilson and Taylor Swift arrive at the premier of ’Miss Americana' at the Sundance Film Festival, Park City, Utah, Jan 23, 2020. Credit: Michael Hurcomb/Shutterstock

Lana Wilson and Taylor Swift arrive at the premiere of “Miss Americana” at the Sundance Film Festival. (Michael Hurcomb / Shutterstock)

PARK CITY, UTAH - JANUARY 23: Christine O'Malley, Caitrin Rogers, Lana Wilson, and Morgan Neville attend the 2020 Sundance Film Festival - "Miss Americana" Premiere at Eccles Center Theatre on January 23, 2020 in Park City, Utah. Credit: Neilson Barnard/Getty Images

Christine O’Malley, left, Caitrin Rogers, Lana Wilson and Morgan Neville attend the 2020 Sundance Film Festival’s opening-night premiere of documentary “Miss Americana.” (Neilson Barnard / Getty Images)