WATCH: Lady Gaga joined U2 on stage last night for ‘Ordinary Love’

"All hail Her Gaganess"

The guest appearance of all guest appearances took place last night, when Lady Gaga casually popped up on stage, in her 10-heels, to join the lads from U2 in a surprise rendition of ‘Ordinary Love’.

The band were playing at New York's Madison Square Garden when the 29-year-old star joined them to perform the song, which was written in honour of Nelson Mandela for the soundtrack to 'Mandela: Long Walk to Freedom'.