Britney Spears' Carpool Karaoke proves that she is well and truly back

Look, she's miming along or singing quietly for most of it but that's not what's important here. What's important is that there's life in her eyes and in her voice again, which means that the Britney of yore that we all know and love is back in the game.

Spears' ten minutes with Corden packs in all the hits from '...Baby One More Time' to 'Make Me' and features plenty of golden moments from Britters, including her admission that she has know idea what the 'it' of 'Oops, I Did It Again' is and that she's swearing off men and marriage but wants loads more kids. How many more? Three, if you're asking (which just happens to be another one of her hit songs. Coincidence? We think not.).

Honestly, we could have watched another 30 minutes of this.

Welcome back, Britney...