With the run she's having, how could Taylor Swift have been on anything other than the winning side?

The pop superstar, whose eagerly anticipated Australian tour kicks off in Melbourne on Friday, was smothered by her celebrity mates at Las Vegas' Allegiant Stadium as her partner Travis Kelce's Kansas City Chiefs clinched an overtime Super Bowl win over the San Francisco 49ers.

She cuddled with Blake Lively during Post Malone's pre-match performance of America the Beautiful on Sunday (Monday AEDT) and won what appeared to be a beer chugging contest - slamming her cup down to an appreciative roar from the fans.

Swift flew halfway around the world to see Kelce and his team play the 49ers.

She completed her trip from the Tokyo Dome to Vegas for the game, walking through security along with Lively, Ice Spice, and her mum Andrea Swift.

Singer Lana Del Rey joined the celeb-packed suite in time to catch Usher's halftime show.

Swift, who has been dating Kelce since the first few weeks of the NFL season, flew on a private plane across nine time zones and the international date line from the last of four shows at the Tokyo Dome in Japan to arrive about two hours before kickoff.

The 14-time Grammy winner walked in wearing a black outfit with a red jacket slung over her shoulder.

"She's unbelievable. She's rewriting the history books herself," Kelce said a day after last Sunday's Grammys.

"I told her I'll have to hold up my end of the bargain and come home with hardware, too."

Swift began dating Kelce after he said on his New Heights podcast he had tried and failed to give her a friendship bracelet during her performance at Arrowhead Stadium in Kansas City.

Kelce then invited her to watch him perform at the home of the Chiefs, and she surprisingly showed up for their week two game against Chicago.

"Having Taylor as a new Chiefs fan is very unique," Chiefs owner Clark Hunt said during Super Bowl week.

"I don't ever do an interview without someone asking me about it. A lot of players and coaches on the team are in the same boat.

"The most important thing is we're happy for the two of them that they have found each other and have such a special relationship."

There was plenty of star power besides Swift for the NFL's marquee night.

Usher's halftime show included guest performers Alicia Keys, Ludacris and Lil Jon, while Jay-Z also made an appearance.

Few were under a brighter spotlight than Swift, though.

Her dash from Tokyo had Swifties around the world watching online flight trackers, while her boyfriend seemed to get as many questions about his relationship as the game during the run-up to kick-off.

The pair won't have a whole lot of time together, regardless of Kansas City's win.

Swift is due back across the Pacific later this week as her Eras tour resumes at the MCG.