Steve Martin is typically unflappable. The veteran comedian and legendary quick-on-his-feet improvisor was atypically dumbstruck recently when his Only Murders in the Building co-star Selena Gomez showed up to fete him on the red carpet premiere of his Apple TV+ two-part documentary, Steve! (Martin).

In a video from the premiere earlier this month, Martin immediately gives Gomez some of his patented good-natured grief, joking, “I thought you said you were gonna get dressed up,” as Sel — wearing a stunning Oscar De La Renta black gown — leans in for a cheek kiss.

“Shush, shush, I’m so happy to be here, my family came!” Gomez tells Martin, who seems genuinely touched by the gesture, saying, “I can’t believe you’re here! Thank you so much… so nice of you!” While Gomez keeps telling him to “stop” making such a fuss, Martin appears to get a bit teary-eyed as the pair pose for some pics.

Gomez tells Martin she’s excited to celebrate him, noting that she brought along her stepdad and grandma, as the funnyman waves to her family and jokes, “here’s what I like about you being here, you don’t know a thing about me.” Selena admits as much, shooting back, “Yeah, that’s why I came, so I can learn.”

She doth protest a bit too much, though, since the pair have very likely learned a lot about each other while shooting three seasons of the Hulu murder mystery comedy alongside Martin’s frequent comedic foil, Martin Short.

The two-part doc streaming now uses a combination of classic and never-before-seen footage to tell the “then” story of Martin’s rise to comedy’s Mt. Rushmore before his decision to abruptly quit doing stand-up tours and his “now” life as a beloved elder statesman joke sharpshooter.

Check out video of the sweet carpet moment below.

Steve Martin is brought to tears after Selena Gomez made a surprise appearance at his documentary premiere:

“I can’t believe you’re here! Thank you so much. It’s so nice of you.”