Sabrina Carpenter's surprise performance at the Taylor Swift Eras Tour in New Orleans

Sabrina and Taylor sang a mash-up of two of their songs...

Sabrina Carpenter gave a surprise performance at the Taylor Swift Eras Tour in New Orleans on her 'day off' from her own concert.

It's not the first time the "Please Please Please" singer has joined megastar Taylor on stage, having opened for the Eras Tour earlier this year before releasing her number 1 hit "Espresso".

Sabrina and Taylor sang a mash-up of two of their songs, both linked by caffeinated lyrics.

Taylor admitted there's one line of "Espresso" she loves to sing...