It's a Whole New Arena: Taylor Switft Presents Beau Travis Kelce to Massive Stadium Crowd ... But Was It His Biggest Ever?

Kansas City Chiefs star Travis Kelce donned a top hat and tails to join his lady love Taylor Swift on stage at Wembley Arena in London Sunday night before what was likely the biggest stadium crowd of his life.

The excited tight end helped Swift with a costume change on stage before she belted out "I Can Do It With a Broken Heart." In one particularly steamy moment, Kelce carried a "sleeping" Swift over to a couch before she stripped down to her stage underwear.

Some 90,000 spectators stood agog. That's close to how many fans Swift has drawn for each of her eight performances over the weekend for her Eras Tour, making an eye-popping total of 700,000 spectators.

Kelce's Superbowl play in February was watched in person by a mere 62,000 spectators at a sold-out Allegiant Stadium Las Vegas, though Superbowl crowds have been as large as 103,000.

But for anyone keeping score, the Las Vegas stadium crowd was dwarfed by 123.4 million viewers who followed the football action on screen in the biggest telecast in history.) as the Chiefs bested the San Francisco 49ers in overtime 25-22 to win the Superbowl.

The duo kept up the energy Sunday night when they dined and partied with celeb pals including Sophie Turner and Elli Goulding at London's happening Chiltern Firehouse.