We all know the feeling. You run into someone unexpectedly and they gush over how great it is to see you, only, you have absolutely no idea who they are. Or worse, vice versa.
Forgetting someone's name (or total existence) can be totally embarrassing for both parties, but what happens when Hollywood's hottest stars aren't recognized by their fellow celebrities? Let's just say things can get pretty awkward.
Scroll through the gallery below to check out a few cringe-worthy stories of celeb-on-celeb encounters.
JERRY SEINFELD VS KESHA
MARGOT ROBBIE VS PRINCE HARRY
Robbie's clearly not the most devout royal watcher. Following a fancy bash, she copped to mistaking the prince for a fellow ginger Brit: "When I saw him in those glasses, I was like, 'Oh, I didn't know Ed Sheeran was at the party!' [Harry] got really offended. He was like, 'Shut up.'" Blame it on the beer goggles?
AMY SCHUMER VS GOLDIE HAWN
JUSTIN BIEBER VS SHAWN MENDES
The Biebs has had plenty of time to make things up to his fellow Canadian pop star since a 2015 radio interview when he was pressed for advice for the up-and-coming crooner — and was forced to ask his publicist, "Who's Shawn Mendes?" Uh… just that future Grammy nominee over there.
MAMA JUNE VS MILEY CYRUS
ED O'NEILL VS BRITNEY SPEARS
While thousands have likely accosted her at airports, Spears' not above making her own gate side selfie request — even if the Modern Family star she asked for a snap hadn't the foggiest clue who she was. But after the pop star tweeted the pic, O'Neill recounted, "My manager texts me and goes, 'What is this? 53,000 likes. It's Britney Spears.'" Oops! He'll… never do it again?
ANDY COHEN VS BRITNEY SPEARS
Though he crawled on all fours while getting smacked with a whip during Spears' bondage-themed performance of her song "Freak Show," Cohen's greatest indignity of the night was likely when the pop star spaced on his name altogether, asking her audience to "give it up for… him!" Him for the win!