Taylor Swift was gripped as she watchedthe Kansas City Chiefs play (Picture: Maddie Meyer/Getty Images)

Swifties will remember the days Taylor Swift wouldn’t even swear in songs but isn’t it strange just how fast the night changes as she drops a major f-bomb at a Kansas City Chiefs game.

At the Chiefs vs New England Patriots game on Sunday, the Anti-Hero hitmaker could be seen watching her tight end boyfriend take to the field as has become tradition since they began dating earlier this year.

Taylor was sat in the family box with friends Alana Haim and Brittany Mahomes days after her birthday party in New York last week.

Gripped on the game, the Eras Tour icon exploded into outrage as Travis Kelce, 34, appeared to be knocked down by a defensive back in the third quarter, with no red flag given.

A video showed Taylor, 34, rising out of her seat, wearing an adorable Chiefs jumper and beanie hat, as she yelled: ‘The f**k?’

Some have said she was calling for a ‘flag’ as fans debated a viral slow motion clip of her cinematic indignation as Alana also threw her hands up in fury.

As she’s grown up in the spotlight it is still sometimes jarring for fans when the Enchanted singer swears, with 1989 Vault Track ‘S**t!’ causing a stir on it’s release in October.

Her album Midnights became the album with the most curse words in after her iconic Reputation era acted as a turning point in her image and broke that sweeter than fiction persona.

Despite Travis’ dramatic fall, the Chiefs still took home a victory as Taylor has become their lucky charm at games.

At one point during the game the 12-time Grammy winner ordered some food to the players’ family box and attempted to tip the staff member with a $100 dollar bill.

She was joined by Brittany Mahomes, Ashley Avignone, Alana Haim, and dad Scott Swift in the box (Picture: Maddie Meyer/Getty Images)

They couldn’t hold back their excitement as the Chiefs won (Picture: AP Photo/Charles Krupa)

Travis Kelce took a nasty tackle in the third quarter to Taylor’s frustration (Picture: Maddie Meyer/Getty Images)

A picture of the star popping her head out the door with cash, looking baffled by how much to spend quickly went viral.

This moment raised a few eyebrows as the capitalist queen who is worth an estimated 1.1billion had been charging fans £19.89 to rent her Eras Tour concert film at home.

Elsewhere in the box, her dad Scott Swift – another converted supporter from the Eagles to the Chiefs – handed out her birthday cake to fans.

Papa Swift, who is rumoured to have separated from Taylor’s mum Andrea, looked proud as punch as he approached a fan with a huge layered confetti cake.

Taylor was rocking full Chiefs merchandise as she showed her support (Picture: AP Photo/Michael Dwyer)

Travis took a few tackles during the game (Picture: USA TODAY Sports via Reuters Con)

Papa Swift was handing out birthday cake to others in the box (Picture: Kathryn Riley/Getty Images)

Taylor, in her usual red lipstick, beamed at the 71-year-old from afar as she spotted him bringing over the treat.

The Look What You Made Me Do hitmaker had celebrated her birthday in style days before with Blake Lively, Gigi Hadid, and a whole host of friends – including the Haim sisters.

She had headed on a night out in New York, heading for dinner then a club in a gorgeous bejeweled little black dress with night sky detail.

Celebrations were in order from the stands (Picture: AP)

The NFL star stepped off the field with Kadarius Toney after securing the win (Picture: AP Photo/Charles Krupa)

Taylor is cheer captain when it comes to Travis (Picture: AP Photo/Michael Dwyer)

Travis did not join Taylor for her birthday due to commitments to training but reportedly sent numerous bouquets to her throughout the day.

The pair have teased details about their relationship, although the All Too Well icon kept things fairly tightlipped as she was named Time Person of the Year.

In an interview with WSJ Magazine, the NFL star spilled the beans and revealed that members of her team secretly went above and beyond to pull their meeting off.

‘There were definitely people she knew that knew who I was, in her corner [who said]: “Yo! Did you know he was coming?” I had somebody playing Cupid. She told me exactly what was going on and how I got lucky enough to get her to reach out.’