Surprise! Lady Gaga flew to Azerbaijan to perform at tonight's Opening Ceremony of the inaugural European Games in Baku. Mother Monster delivered an emotional rendition of John Lennon's classic "Imagine" as part of the two-hour show.

Gaga said: "I'm extremely honoured to be playing at the Opening Ceremony in Baku, and to be celebrating all of the amazing athletes who will compete in the European Games in this beautiful city."

"I had such a great time with the audience," she added later. "It felt like we were in my bedroom singing songs and imagine life was more simple." 

Watch Lady Gaga sing "Imagine" by John Lennon below...

Monsters, did you enjoy Lady Gaga's performance? Sound off in the comments below!