The Super Bowl has started! Kansas City Chiefs vs San Francisco 49ers kicks off in star-studded Las Vegas – with Taylor Swift and her celeb squad in the $1 million Kelce family suite to watch the action unfold

The biggest Super Bowl in history came to life in the second quarter in Las Vegas, with Travis Kelce appearing to battle his coach Andy Reid after the Chiefs got off to a stuttering start against the San Francisco 49ers.

After the first quarter ended without either team scoring, San Francisco took the lead early in the second quarter when Jake Moody made Super Bowl history by converting the longest punt in its history at 55 yards. It would also have looked good from a longer term perspective.

And then things started going wrong for the Chiefs, even if things weren't really going well up until that point.

Mahomes picked off Mecole Hardman with a 52-yard bomb, but on the next play, wide receiver Isiah Pacheco made an uncharacteristic fumble. He apologized to every member of his teammate on the bench at Allegiant Stadium.

But as the Chiefs left the field, Kelce seemed to have an argument with the coach he speaks so often about how much he respects.

Swift returned to take her place in the $1 million Kelce family suite, with her crew and his family sitting one row behind her

Kelce is tackled by San Francisco 49ers defensive lineman Chase Young during the early parts of the first quarter

Young then broke through the Chiefs O-Line and sacked Patrick Mahomes, while 49ers teammate Nick Bose celebrates

The 34-year-old Kelce, one of the Chiefs' star men, looked typically cool and collected during warm-ups

Reid almost seemed to lose his balance for a moment when Kelce bumped into him, Taylor Swift's boyfriend practically holding his arm to keep him upright as he screamed.

It was a repeat of the Christmas scenes that were so shocking when the Chiefs meekly surrendered in a home loss to the Las Vegas Raiders.

Then on the next offense, Mahomes loses 10 yards due to intentional grounding at a time when they needed the quarterback to step up.

In the first quarter, both teams had stuttered as they tried to switch gears.

49ers running back Christian McCaffrey, so often imperious with the ball under his arm, fumbled for the first time since Week 7, a streak of more than three and a half months that ended early in the biggest stretch of them all.

These were extremely unusual errors for both him and Pacheco, who lost the ball in the second inning.

But the Chiefs had no early success of their own to shout about and Chiefs quarterback Mahomes was sacked when Chase Young broke through the Chiefs O-Line.

The action started shortly before 7:00 PM EST (4:00 PM local time) at Allegiant Stadium, after country music icon Reba McEntire sang the national anthem. Swift had returned from Japan for the match after playing four consecutive nights on her Eras Tour in Tokyo

She'll be lumped into a suite — which boyfriend Travis reportedly paid $1 million for — with the rest of the Kelce family, her own mom and dad, and friends Ice Spice and Blake Lively.

She was seen giving Kelce's older brother Jason a hug as they were reunited and he then introduced himself to American rapper Ice Spice – scenes that NFL fans never thought possible when the season started in September.

The Chiefs won the pregame coin toss and deferred, leaving the 49ers with the ball in the battle for the Vince Lombardi Trophy.

For Travis and the Chiefs, the game finally getting underway draws a line under two weeks of intense build-up, with the tight end in particular receiving a new wave of attention thanks to his girlfriend.

A win for Kansas City would see the team join a unique club of consecutive Super Bowl winners, but history is also at stake for San Francisco.

If they win tonight, they will join the New England Patriots and Pittsburgh Steelers for a record six Super Bowl titles.

Chiefs quarterback Patrick Mahomes (center) gives a late team talk in Kansas City as Kelce stood next to him

Brittany Mahomes, the wife of Chiefs quarterback Patrick, took the field with their children before the game

Rapper Jay-Z stood on the field at Allegiant Stadium in Vegas ahead of the Chiefs-49ers game

The Swifties still entered the stadium for the biggest night on the American sports calendar

While there is a lot of attention on the Chiefs, the 49ers could seal a record-tying sixth Super Bowl with a win