Selena Gomez gets a matching tattoo with Julia Michaels as the singers design their new inking backstage following joint performance

Selena Gomez will never forget her surprise performance with Julia Michaels on Monday night.   

The singer, 27, and her collaborator, 25, received matching tattoos after performing together at the Fonda in Los Angeles. 

The tattoo artists who inscribed the ink, Brad Reis and London Reese, documented the design process on their Instagram page.   

An unforgettable night: Selena Gomez and Julia Michaels received matching tattoos after their show together at the Fonda in Los Angeles

An unforgettable night: Selena Gomez and Julia Michaels received matching tattoos after their show together at the Fonda in Los Angeles

In videos posted to both their accounts, the girls were still backstage as they prepared for the tattoos.   

'A point like that with a line, or did you want it to have like a cool triangle?' London asked the girls, who were holding hands.  

'Let's do that!' Julia said, before turning to Selena. 'What do you think?'

'Yeah,' the songstress replied. 

Tatt one please: Tattoo artist London Reese offer design suggestions for the girls

Tatt one please: Tattoo artist London Reese offer design suggestions for the girls

Moral support: The girls held hands as London prepared the matching tattoos

Moral support: The girls held hands as London prepared the matching tattoos

Exactly what tattoo the girls got remains unknown. 

Brad captioned the video of the girls, 'So last night I got to tattoo @selenagomez while my main brother @londonreese tattooed his bestie @juliamichaels , safe to say last night was super rad and meaningful for me! London your the f**king man and I'll never forget the way you put me on! Going up gang in full effect!'  

London was just as effusive in his caption.

What do you think? Michaels asked Selena for her opinion on the pitched design

What do you think? Michaels asked Selena for her opinion on the pitched design

Strike a pose! Tattoo artists Brad Reis and London Reese posed backstage with the leading ladies

Strike a pose! Tattoo artists Brad Reis and London Reese posed backstage with the leading ladies

'Spent the last couple days celebrating the birth of one of my faves, miss @juliamichaels. Went to her show with @bradreis_tattoo and I tattooed Julia while my dude tattooed the ever so sweet @selenagomez. The vibes were the sickest and both these girls are as dope as you could hope for. Happy birthday, Feej! Love ya, kid!!' 

Selena co-wrote her new empowerment track Lose You To Love Me alongside Julia, who is currently on tour. 

The pop star surprised audience members at Julia's show Monday night, joining her on stage to sing their song Anxiety. 

Julia's tour continues with stops in San Francisco, California, Portland, Oregon, Vancouver, Canada, followed by several shows in Mexico. 

Her everything! Gomez called Julia 'my love, my heart, and my soul' in a sweet Instagram snap

Her everything! Gomez called Julia 'my love, my heart, and my soul' in a sweet Instagram snap

Sing it! The Come And Get It songstress joined Julia onstage to perform Anxiety

Sing it! The Come And Get It songstress joined Julia onstage to perform Anxiety 

Selena Gomez and Julia Michaels get matching tattoos backstage

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