Swifties believe Taylor Swift hinted at a future with boyfriend Travis Kelce.

The “Cruel Summer” singer, 33, shocked the crowd in Argentina Saturday night when she started playing her hit song “End Game” as part of her surprise acoustic set.

The track — which is from her 2017 album, “Reputation” — includes several sports references and describes a romance that Swift believes will never end.

Her decision to play the song with Kelce, 34, in the crowd seemingly indicated that she sees their relationship going the distance — and fans believe they noticed a specific hint that confirms their theory.

Right when Swift started to play the song on piano, the crowd’s color-changing wristbands started flashing red and gold — the Kansas City Chiefs’ colors.

NFL fans Revels that Travis Kelce send Taylor Swift a later that got her crying through out today

“Just realized the bracelets changed from Blue to RED + GOLD (Chiefs colors) during End Game * with Travis present 😭 ♥️,” one fan wrote atop a video of the crowd on TikTok.

“She’s a mastermind, after all & the whole show was like a huge love letter to travis,” a second person added.

“Can we re-focus on the fact that Taylor opened her heart out in front of 80k people, Travis included?” another fan wrote on Twitter. “The bracelets lights being red and yellow while she sang her heart out to End Game 😭. This was her saying ‘Yes, I’m in love, yes that’s my man, yes I want him to be the one.’”

NFL fans Revels that Travis Kelce send Taylor Swift a later that got her crying through out today

“I just wanna know what miss ma’am was playing at, singing endgame and having everyone’s bracelets INCLUDING Travis’ light up red and yellow,” a fourth person chimed in.

While there is no video of Kelce’s reaction to the secret message, Swift seemingly tried to suppress a smile while looking out at the illuminated crowd.

Yet “End Game” wasn’t the only song Swift dedicated to her new man during the show.

The 12-time Grammy winner couldn’t keep her eyes off Kelce as she sang “Lover” — despite “disassociating” while singing the love song during previous shows.

Swift had a smile plastered across her face as she stared into the VIP tent — where the athlete danced with her dad, Scott Swift — while singing about being madly in love.