Mariah may have been the first guest on Corden's Carpool Karaoke (which is so good it's possibly getting it's own show), but his next guest is going to be just as epic in the diva stakes. It's only JLo. 
Lopez has a stint in Vegas to promote, hence all the TV appearances (where she's been relentlessly questioned about her alleged beef with Mariah), and this one is set to be her finest - mainly because it involves her crooning in a car. There's no place to hide; unless Corden's vocals drown you out, which has been known to happy (just ask Iggy). 

Corden made the announcement via twitter. We await next Wednesday morning with baited breath.