Supernova celebrity Rihanna cannot risk being seen in public with a fashion fail that raises eyebrows. That is why she takes special measures to ensure she always looks radiant and red carpet ready.

And speaking of eyebrows, Rihanna does not mess around. The "What's My Name?" singer has lookalike models to test eyebrow styles so she can choose a flawless look tailored to her visage.

Hollywood brow artist Damone Roberts revealed a beauty secret from when he prepped Rihanna for the Met Gala earlier this year at New York's Metropolitan Museum of Art.

He said the R&B; singer consulted him on lightening her brows, and he spilled the details with Entertainment Tonight on what went down.

"So Rihanna's so fly that she has a lookalike model come by your space and you try out different looks on the eyebrows on the model and you send pictures to Rihanna and she decides whether she wants to do it or not!"

Roberts is clearly a fan and enjoyed reminiscing about working together.

He continued:

"So literally a lookalike model we trialed and tried and everything else until we got them perfect and we sent Rihanna the pictures and we heard nothing and of course two days before the Met Gala she's like, 'I loved them! You gotta fly to NY and take care of me!' and do them and whatnot, and of course Rihanna shut down the show! It was really, really special."

Tapping into the "Heavenly Bodies" theme of the 2018 Met Gala, Rihanna reigned supreme with papal headgear and draped in a cream-colored, jewel-studded gown by designer John Galliano.

Only royalty like this pop music queen can appoint lookalike models to test out eyebrow styles for her, and it is clear Rihanna embraced this year's theme with her magisterial grace.

She wore it well – brows, gowns, et al.

Roberts' A-list clientele consists of other fierce luminaries, including, Beyonce, Rihanna, Christina Aguilera, Kim Kardashian-West, Jenna Dewan, Tracee Ellis Ross, and Nicki Minaj, to name a few.

When considering shaping a client's eyebrows, Roberts studies the a client's facial features first. He used Reese Witherspoon – "who has say a more of a longer chin" – as an example.

"You don't want to give them a higher arch because what happens is it creates more space between the face, so you would give her a straighter eyebrow which would kind of shorten things."

"Someone like Brooke Shields has more or strong features, so you don't want to give her a really strong arch because it's going to make her face look a lot more severe. You want it to be softer, so you give her a softer arch."

After working with Rihanna, Roberts gushed about her personality and said she has "become one of his favorite people."

"Now of course I was a fan like everyone else, but once I started working with her this year I have become a fan of her as a person because she is so fly and dope!"

We can't argue with that.

Check out the ET interview with Hollywood's king of eyebrows in the YouTube clip below and see him in action.

Hollywood's Eyebrow King, Damone Roberts, Shares How to Get the A-List Brow www.youtube.com