Ronnie Wood surprised James Bay's fans at London's Brixton Academy over the weekend, when he joined Bay on stage for a rendition of the Faces classic "(You Know) I'm Losing You."

"It's been a mad few weeks. Back at the beginning of September, Ronnie presented me with an award . . . so I was lucky enough to meet and get to hang with him . . . that night."

"Later on, Ronnie and I got talking, and he'd asked what I was up to, etc. I'd been telling everyone how excited I was about my three nights coming up at Brixton Academy.

Next thing I know, all caught up in the moment, the question just jumped out, 'Would you be up for joining me onstage?'

He said he'd totally be up for it. And that was that."