The McGregor-Aldo-Mendes saga has taken arguably its most shocking twist to date.
Sinéad O'Connor has confirmed on her official Facebook page that she will sing 'The Notorious' into battle with Chad Mendes at the MGM Grand Garden Arena in 9 days time.
The 'Nothing Compares 2 U' star posted the status which was met by considerable acclaim by Irish fans, and also revealed a slightly unsurprising setlist for her compatriot's entrance.
That hashtag, by the way - we thought she was meant to be some sort of priestess?
McGregor usually approaches the octagon to a recording of O'Connor's rendition of The Foggy Due before it fades to something a bit different, and dare we say it, a bit more UFC.
May Christ guide us through Sinéad O'Connor's potential attempts to rap along with 'Hypnotise' by the other Notorious, Biggie Smalls.
That would be spine-tingling in all the wrong ways.