But one very special Coldplay fan watched the Las Vegas show from the sidelines: Martin's new lady love, Jennifer Lawrence.
Following a few quiet date nights at Martin's Malibu home and a romantic dinner on Sept. 8, the actress stepped out to support the musician for a more public – and louder – appearance.
"She was off to the side of the stage when he performed," a source tells PEOPLE.
Lawrence, who was seen backstage, showed off her midriff in a studded black crop top, matching denim bottoms and stilettos.
And Martin seemed to take notice.
"I've never seen such a well-dressed audience," he said.
The Hunger Games star watched as Coldplay performed a 30-minute set that saw them spray star-shaped confetti over the sold out crowd.
"After his set, she snuck back into his dressing room," the source adds.
But prior to the performance, Lawrence was treated to a much more intimate show.
"She was watching him during his closed rehearsal and was singing along," says the source.