Watch Billie Eilish autograph Melissa McCarthy's forehead at The SAG Awards

Melissa McCarthy might just be Billie Eilish ’s biggest fan, as McCarthy took the opportunity to fan-girl freak out over Eilish while presenting at 2024 Screen Actors Guild Awards.

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During their few moments on-stage, just before presenting the award for Outstanding Performance by a Female Actor in a Comedy Series to Ayo Edebiri ( The Bear ), McCarthy hilariously asked Eilish to sign her forehead with a permanent marker. Here's how it went down.

Prior to the autographing, McCarthy reminded Eilish that the pair had already met several times prior to award show,  which streamed live on Netflix on Saturday February 24.

“I actually met you in utero because your mom was my first improv teacher,” McCarthy said excitedly, referring to Maggie Baird . “Guess who she was pregnant with? It was you!”

“Wow, OK,” Eilish responded. “That’s a lot.”

McCarthy then asked the Billie if she would sign her shiny colored gown. “I’m just trying to be more present in making memories and I’m trying for more YOLO-ing and less FOMO-ing,” McCarthy said.

Eilish politely declined, leading McCarthy to make an even more bizarre request — for the singer to sign her face instead. Billie obliged and proceeded to scribble her signature on McCarthy’s forehead with a black Sharpie.

McCarthy fan-girled some more, asking questions about FINNEAS and “putting down sick tracks.” Over it, Eilish replied “I think that’s better,” while holding her hand over McCarthy’s mouth.

Obviously it was all part of a bit, duh. But you gotta love their commitment. Check out a clip of the moment below.