You can assume Gwen Stefani doing Car Pool Karaoke will be cool, can't you? One of the coolest rock stars on the planet, rocking up for a sing song? That's gotta be pretty awesome.
Almost as cool as that time James Corden stole J-Lo's phone and text Leo DiCaprio. Almost. But the Late Late Show presenter knew he'd have to bust out the big guns to top a nickname revelation like 'Boo-Boo' (yep, that's what Leo calls Jenny From The Block. Actually. Go back to your crap life now).
So what did he do? Called up George Clooney and JULIA EFFIN' ROBERTS.
They sang Queen songs.
They delivered their most iconic movie lines of all time.
And generally made your squad look four rotten apples in a carrier bag.
Oh, and he got Gwen Stefani to act out all her fave emojis, because what the hell else do you ask the goddess of 90s pop rock:
Watch the whole thing here: