Coldplay marked their fifth time headlining the annual event over the weekend

Dakota Johnson is Chris Martin’s number one fan!

The actress, 34, supported her fiancé during Coldplay’s headlining set at the Glastonbury Festival in the U.K. on Saturday, June 29.

During a live stream for the event, Johnson was captured watching Martin, 47, and his band perform from the side of the stage.

Dressed in dark attire, the Madame Web star was joined by others watching Coldplay as they marked their fifth time headlining the annual event.

Johnson’s attendance at Martin’s latest gig came about after a source recently told PEOPLE that the couple’s relationship is in a good place.

“They’ve had ups and downs, but now they’re definitely back on,” the source said, adding that the duo is “going strong.”

Johnson and Martin have typically kept their relationship private over the years. A source told PEOPLE in March that the couple “got engaged years ago but were in no rush to get married.”

They began dating sometime in 2017, three years after Martin and his ex-wife Gwyneth Paltrow famously “consciously uncoupled.” (They finalized their divorce in 2016.)

At one point during Coldplay’s Glastonbury Festival set, Michael J. Fox joined the band to play guitar.

The group first performed “Humankind,” Variety reported, before Fox, 63, strummed on a guitar during a performance of Coldplay’s “Fix You.”

After the performances, Martin gave a shoutout to Fox. “The main reason we’re in a band is because of Back to the Future,” the rocker said, per Variety, referencing Fox’s famous film. “So thank you to Michael, our hero.”

Earlier in the night, Coldplay brought out rapper Little Simz as a surprise guest to debut a new song.