And Swift was left having to comfort Brittany after her new pal watched her husband, Chiefs quarterback Patrick Mahomes, struggle throughout the loss.

Patrick Mahomes threw a pick-six in the second quarter and generally played below his lofty standards as Las Vegas defeated their division rivals.

Taylor Swift was seen comforting Brittany Mahomes as the Chiefs lost to the Raiders

The wife of Chiefs quarterback Patrick Mahomes looked extremely anxious during the game

Travis Kelce finished the game with just five catches for 44 yards as the Chiefs were defeated

Patrick Mahomes threw a pick-six in the second quarter as the Chiefs offense faltered again

And the wife of the Kansas City passer was visibly upset after the result, looking shell-shocked and putting her hands to her face as Swift rubbed her shoulder.

The pop star also looked deflated with the loss marking the second loss NFL beau Kelce and the Chiefs have suffered with her in attendance.

Brittany was likely upset over her husband’s visible frustration. As the final minute ran down on the clock, cameras caught quarterback Mahomes looking misty-eyed on the sidelines.

As the Raiders began to celebrate their festive win, the broadcast zoomed in on Mahomes who had tears in his eyes and bit his lip as he desperately tried to keep them at bay.

Earlier in the game, the signal caller had let his emotions spill out in a slightly more aggressive way.

He was seen berating his offensive linemen as the reigning Super Bowl champions struggled to break down the Raiders’ defense.

The two have quickly struck up a close friendship since the songstress struck up her high profile relationship with the Chiefs tight end and began attending his games alongside the longtime WAG.

The new friends further cemented their blossoming friendship as they wore matching red Santa hats for the Christmas Day game with Taylor’s embroidered with an ’87’ on the front and Brittany’s with a ’15’ in tribute to their partner’s respective jersey numbers.

The songstress could be seen leaning in to talk to her stressed out pal in the Arrowhead suite

Swift wore matching Santa hats with the other Chiefs WAGs, including Lyndsay Bell (pictured right of Swift), wife of Kansas City tight end Blake Bell

Kansas City Chiefs star Patrick Mahomes appeared to tear up during Monday’s loss

The pair have been almost inseparable since Swift and Kelce took their relationship public and even debuted a personal handshake to celebrate Chiefs touchdowns in October.

Brittany also appears to have been accepted into Taylor’s inner circle, as she joined her friend group of Selena Gomez, Gigi Hadid and Sophie Turner out for dinner in New York City last month.

The former collegiate soccer player also jetted into Green Bay with Taylor on the Anti-Hero hitmaker’s private jet at the beginning of the month and appeared to have lent Swift a red Teddy coat she previously wore at a game for the frigid matchup against the Packers.

Brittany, a mother of two, claimed last week on Instagram that there had been ‘a lot more rude a** people’ on social media amid her blossoming friendship with Swift

While Brittany didn’t name Taylor in her post, the timing does coincide with their blossoming friendship.

Swift jetted into Kansas City on Monday and arrived at Arrowhead with her parents – and Santa Claus.

Swift and Brittany have struck up a close friendship since the singer started dating Kelce

Brittany also appears to have been accepted into Taylor’s inner circle, joining her girl squad of Selena Gomez (right), Gigi Hadid and Sophie Turner out for dinner in New York City

Kelce was again a key weapon for the reigning Super Bowl champions even as they struggled to break down the Raiders’ defense.

The tight end made one particularly impressive carry that had fans at Arrowhead on their feet. Swift was seen screaming ‘Travis!’ and ‘Oh my God!’ as he carried the ball up field.

However, the two-time Super Bowl winner was later seen letting his frustrations get the better of him as the Chiefs began to slump to their loss.

Shortly after the Chiefs had gifted their opponents back-to-back defensive touchdowns in an NFL record seven seconds, Kelce made his way back to the sidelines and threw his helmet in disgust.

CBS cameras caught the exact moment it happened, with the helmet bouncing off the turf and into the stands at Arrowhead.

Chiefs Kingdom once again turned up to Arrowhead, celebrating the 12-time Grammy winner

The Anti-Hero hitmaker looked festive in a red jumper and black and white plaid skirt

She sat alongside a Santa – thought to be brother Austin – who wore a Chiefs Santa hat

The Grammy Award winner was also spotted pressed against the glass with a little girl

The singer had hot footed it across the country on Monday in order to see her boyfriend in action for Kansas City.

Swift’s private plane left Nashville around 8am ET before touching down at Charles B. Wheeler Downtown Airport shortly after 10am local time.

She was then whisked towards the stadium, making the 12-mile drive with her team before arriving at Arrowhead around 11am.

She was carted into the stadium on a VIP golf cart alongside another special guest: Santa Claus, who carried a sack and wore a special Chiefs hat.

‘Merry Christmas!’ Swift said as she made her way into the stadium, while Santa Claus rang a bell. She was soon met by adoring fans, who screamed as she walked towards her suite.

Swift arrived at Arrowhead for the Chiefs’ Christmas Day game vs. the Raiders alongside Santa

‘Merry Christmas!’ Swift said as she walked into Arrowhead while Santa Claus rang a bell

The pair of VIPs head into the stadium ahead of the Christmas Day showdown vs Las Vegas

Reports claim the couple will spend Christmas Day and New Year’s Eve together in Kansas City

Also among the convoy were the singer’s parents, Andrea and Scott. Swift’s father was also alongside hearing at Gillette Stadium last week, wearing a Chiefs jumper as the Chiefs beat the Patriots.

On Monday, he was decked out in a Christmas hat and a Christmas sweater for the game. It’s believed to be the first game Andrea Swift has attended with her daughter.

Reports earlier this week claimed Swift and Kelce will spend Christmas Day and New Year’s Eve together in Kansas City, with the Chiefs back in action on December 31 against the Bengals. She is expected to be at Arrowhead for both games.

The singer has been a common sight in the stands for Chiefs game since her romance with tight end Kelce became public earlier in the season.