Swift was in Indianapolis to perform for her Eras Tour at Lucas Oil Stadium, and Clark made sure to get a ticket.
Clark posted from her seat, "IM FIRED UP!!!!!!!" when in attendance for the concert.
The Indiana Fever star once posted on X: "Taylor Swift welcome to the good side #chiefskingdom" as the pop star's relationship with Kansas City Chiefs star Travis Kelce surfaced last fall.
Clark, at Friday's show, also heard "Enchanted," a favorite Swift song of hers.
The WNBA Rookie of the Year reveled in the moment and posted about it on her Instagram story.
She was also seen seemingly trading friendship bracelets with fans while at the concert.
Clark was also awarded a new head coach Friday, with the hiring of Stephanie White, who returns to the Fever after a two-year stint with the Connecticut Sun.
White led the Fever to the playoffs in 2016 before bolting to Vanderbilt to coach college basketball.
White's Sun squad swept Clark and the Fever in the first round of playoffs this past season but is now back in Indiana, her home state.