By Megan Daley
May 28, 2015 at 04:50 PM EDT

Fleetwood Mac kicked off its European tour at London’s O2 Arena Wednesday night with two special guests in attendance: British powerhouse Adele and Florence + the Machine’s Florence Welch. 

According to NME, Stevie Nicks dedicated the iconic “Landslide” to Adele, and both singers joined Nicks backstage for a photo — with Adele calling the evening the “best night” of her life. 

Fleetwood Mac is scheduled to perform at the O2 Arena again Thursday night before heading to the Netherlands. The tour will make stops in Germany, Belgium, Ireland and throughout the UK this summer. 

Florence + the Machine recently dropped “Delilah” off the upcoming album, How Big, How Blue, How Beautiful, set to debut in the U.S. on June 1. Take a listen here