It is the first time the pair have taken to the stage together, after officially announcing their relationship on Instagram on Friday evening.

Tonight the American footballer joined Taylor onstage for a costume change before the song I Can Do It With a Broken Heart – sending fans into a frenzy once again.

The athlete was dressed up in a white bow tie, tailcoat and top hat.

He picked Taylor up, fanned her and powdered her face as part of the act.

Before Taylor carried on with her performance, she made sure to blow a kiss to her NFL beau.

Taylor Swift is joined onstage by her boyfriend Travis Kelce during a costume change on Sunday’s show

Taylor Swift is joined on stage by Travis Kelce (R) during the Eras Tour show tonight

Travis carries Taylor across the stage during a costume change

Travis uses a make-up brush to powder Swift’s face as part of the act

The American footballer was dressed up in a white bow tie, tailcoat and top hat and powdered Taylor’s face as part of the act

But Taylor ‘hard-launched’ their relationship by posting an adorable photo of herself and Travis posing with the Prince of Wales and his two children – Prince George and Princess Charlotte.

Fans branded the star-studded selfie as ‘iconic’.

The 34-year-old singer has been dropping hints about her relationship with the NFL player for a while now.

During her sell-out Eras Tour, Swift changed a lyric in her popular song Karma from ‘Karma is the guy on the screen’ to ‘Karma is the guy on the Chiefs’ – referencing Travis’s Super Bowl winning team.

Eagle-eyed Swifties have also spotted Travis in the VIP tent making loving gestures at Swift throughout her three-hour long set.

But tonight Swift was wooed by the crowd as well as her new boyfriend.

Adoring fans stood, cheered and stamped their feet for over five minutes – leaving the megastar speechless.