Watch James Corden's Epic Carpool Karaoke Session With Mariah Carey (Video)

Mariah Carey and James Corden

Brace yourself for "Always Be My Baby," "Vision of Love," "Fantasy (Bad Boy Remix)" and the two's best British, Brooklyn and Southern accents.

James Corden still is introducing his unique late-night take during his first week of hosting The Late Late Show, with one bit being "carpool karaoke" sessions with stars. First up: Mariah Carey.

The singer accompanied the comedian on his way to work in an effort to beat the Los Angeles traffic.

Meanwhile, the two nailed every run in her biggest hits, including "Always Be My Baby," "Vision of Love" and "Fantasy (Bad Boy Remix)," despite her pleas: "I'm not singing today — I was up all night!"

Watch the video below, which includes Carey's best British accent and Corden's Southern sound.