Taylor Swift wears her heart on her sweatshirt in Kansas City Chiefs merch while cheering lover Travis Kelce's win... and even picks up new bestie Brittany Mahomes in giddy celebration

Taylor Swift was proudly decked out in Kansas City Chiefs attire as she cheered on boyfriend Travis Kelce as the three-time Super Bowl champions took on the New England Patriots on Sunday.  

The Bad Blood songstress, 34 - who was joined by A-list pals Brittany Mahomes and Alana Haim - whisked herself to Gillette Stadium in Foxborough, Massachusetts to watch the Chiefs defeat the Patriots 27-17. 

She could be seen intently viewing the game from a VIP box at the venue, and donned a gray Chiefs sweatshirt as well as a plaid miniskirt. 

Her blonde locks flowed down past her shoulders, and were partially covered by a white and red-striped beanie that had Kelce's jersey number, 87, printed in black at the front. 

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 slipped into a pair of sheer tights as well as black shoes to complete her overall look for the big day. 

Swift added chunky rings on each of her hands to accessorize the outfit and also wore her classic, red lipstick as a final touch. 

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 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.  

Stylist Ashley Avignone also joined the award-winning songstress for the festivities, and was seen wearing yellow, plaid trousers as well as leather jacket that was secured with a belt. 

Alana Haim, who is known for being a member of the rock band Haim, showed off her Chiefs pride in a Kansas City jacket and light, denim jeans. 

She was spotted applauding and cheering on the team as she sat amongst the A-list crowd in the VIP box suite at Gillette Stadium. 

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. 

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 NFL player dressed warmly in a dark green, turtleneck sweater and tan-colored trousers while strolling outdoors. 

He also carried a large duffle bag in his right hand as well as bottles of Gatorade to help him stay hydrated. 

Earlier this week on Wednesday, Taylor rung in her 34th birthday in NYC alongside her A-list friends, including Blake Lively and Zoe Kravitz. 

The pop songstress later shared Instagram snaps capturing her epic celebrations, which saw Swift party the night away inside an eatery alongside her pals and various 'squad' members.

The snaps depicted the singer posing up with friends Blake Lively, Gigi Hadid, Sabrina Carpenter and more - but no sign of her boyfriend Travis Kelce.

She was presented a frosted, layered cake by Zoe Kravitz, and enjoyed a yummy cocktail alongside Jack Antonoff.

She displayed her cheeky side as she stuck out her tongue for the camera and clutched her nearly empty beverage.

'Can't believe this year… actually… happened? Thank you for all your beautiful birthday wishes yesterday,' she captioned the post.

The photos showed the crowd cheering Taylor on as Zoe presented her with her birthday cake.

The revelers gathered around for a group photo which saw Taylor throw an arm around Blake and another pal as Zoe held up the cake. She also shared a snap of herself striking a silly pose with Sabrina.

Although Kelce was not seen at the festivities due to practice with the Chiefs, a stunning bouquet of pink peonies was notably delivered to her Manhattan apartment and are presumably from the sports player. 

Despite his absence, a source recently opened up to DailyMail.com about Kelce's plans and intentions for her birthday and the holidays. 

'It isn't about gifts for him, though he will be getting gifts for her, but he wants to provide an experience for her that is likely going to be more than just today.' 

'He is looking to lead things into Christmas and the New Year and have it be all about her,' the insider added. 

'He wants to be with her as often as possible and after the season he intends to join her on tour.'

The source further revealed, 'They are going to take their romance all over the world. He is very excited to make her feel like a princess.'