Taylor Swift and Alanis Morissette duet ‘You Oughta Know’ on 1989 tour

That was followed by Ellen DeGeneres strutting her stuff down the runway in a shimmery silver tutu for “Style”.

And, during her 1989 World Tour, Swift has been bringing out a series of singers and celebrities during her stadium shows, from the inspired (Mary J. Blige, Uzo Aduba) to the head-scratchingly random (Matt LeBlanc, Chris Rock). Swift noted that Morissette made it possible to sing about “raw feelings” and one’s life, and “you could get really, really mad if you wanted to”.

“It is fair to say that so numerous female singer/songwriters of my generation, including myself, would not write the way that we do without her and her music”, Taylor told her sold out audience as the fans squealed with excitement. Swift called the tune the “greatest breakup song of all time”.

Morissette then joined Swift, who – let’s be real – has written some pretty excellent breakup songs, on the stage to perform an impassioned version of “You Oughta Know”.

“We know with alcohol, you just don’t drink it and don’t go to a bar”.

The song is off Morrisette’s 1995 mega-album Jagged Little Pill.

After the gig, Swift added on Twitter, “Tonight”.

On Monday night, the 25-year-old pop princess welcomed a few new members into the #squad – Alanis Morissette, Natalie Maines and Ellen DeGeneres – and performed what might be her best duets to date.

What do YOU think about Taylor and Alanis performing together, HollywoodLifers? “Singing “Goodbye Earl” with Natalie tonight was unbelievable”.