Taylor Swift proudly wears handmade crochet beanie with boyfriend Travis Kelce's jersey number as she watched the Chiefs defeat the Patriots (and it immediately sells out)

Taylor Swift wore a custom-made, crocheted beanie with her boyfriend Travis Kelce's jersey number embroidered on the front that was 'gifted' to the pop star by a fan. 

The Love Story hitmaker, 34 - who was joined by BFF Brittany Mahomes and Alana Haim at Gillette Stadium - proudly rocked Kansas City attire as she watched the Chiefs defeat the New England Patriots 27-17 on Sunday. 

Along with a gray sweatshirt that supported her beau's team, the Grammy winner also donned a white and red-striped beanie that contained a fluffy, brown ball at the top as well as the number 87 stitched in black. 

In a post uploaded to X, formerly known as Twitter, a user with the handle  @tswiftstyle revealed the hat was 'handmade' by '#KutTheKnit ($30) - an employee of KC vintage shop #WestsideStorey who gifted her the piece.'

'Taylor has previously worn their vintage sweatshirts!' concluded the message, followed by a link to the designer's Depop page - which is a social e-commerce company. 

On KutTheKnit's main page, the same version of the beanie has already sold out.

The hat's description reads: 'Crochet chiefs hat AS SEEN ON TAYLOR SWIFT HERSELF!! handmade to order all materials are secondhand, so coloring may vary.'

The seller also noted that the number stitched on the beanie can also be customized.

Sunday's game was the seventh in total that Taylor has attended to cheer on her beau - whom she began dating over the summer. 

The star has made a statement at each game while sporting Chiefs attire or team colors, such as jackets and special friendship bracelets. 

Last week, the songstress wore a vintage, red and black-colored sweatshirt also from Westside Storey - which had been priced at $250. 

The owner of the vintage shop, Chris Harrington, told FOX Business on Thursday that back in October, an online order had been placed 'that was a little larger than a typical online order.' 

He then revealed that after experiencing a 'medium fraud' alert, the addresses ended up being 'tied to Taylor Swift and her camp.' 

The order contained not only the sweater she donned last week, but also four other vintage Chiefs sweatshirts. 

Two months after the order had been placed, Swift was seen wearing the $250 vintage sweater as she watched the Chiefs vs. Buffalo Bills match on December 10.

Harrington expressed, 'Just the concept of that sweatshirt being in my closet just like a month ago and now seeing it on her and the biggest stage, the biggest star, was surreal.' 

'I know we didn't necessarily create that sweatshirt, but it was just cool to be connected to it.' 

The Kansas City-based store has seen a big spike in sales and Chris explained that he has seen growth of '500%, 600%, today we're 1,000% over our typical sales...'

On Sunday, Taylor paired her custom beanie and gray Chiefs sweater with a stylish, plaid miniskirt. 

Shortly after arriving to the stadium, the beauty was spotted wearing a black coat to help her stay warm in the chilly temperatures.

The pop star - who celebrated her 34th birthday earlier on Wednesday - slipped into a pair of sheer tights as well as black shoes to complete her overall look for the big day.

The Grammy winner was also accompanied by her father, Scott, who sported a red and black-colored Chiefs sweater, despite being a Philadelphia Eagles fan.

Her father previously met Kelce during the singer's concert stop in Argentina last month which the pair both attended, and Scott notably was seen wearing a Chiefs lanyard at the time.

Brittany Mahomes - the wife of Chiefs quarterback Patrick Mahomes - was also seen near the Love Story singer for portions of the game.

Taylor's new BFF donned a black ensemble which was layered with a fashionable, white coat that she chose to leave unbuttoned.

At one point, Swift was seen excitedly lifting the mother-of-two into the air as they celebrated the Chiefs scoring a touchdown.

Alana Haim - from the rock band Haim - as well as stylist Ashley Avignone were also spotted joining in on the fun. 

Not long after the game ended, Kelce was seen leaving the stadium with his other teammates on a bus in exclusive photos from DailyMail.com. However, his girlfriend was nowhere in sight.

The Chiefs had a rough start to the game and initially trailed behind the Patriots - until the Kansas City based team took the lead at the end of the first half.

At one point, Taylor was spotted yelling out 'f**k' in frustration as she watched Travis drop the football in the end zone during a play.

The singer was also seen tipping stadium employees who had brought food to her VIP suite during Sunday's game. In one image, she could be seen exchanging a $100 bill with a food runner.