Christina Aguilera hasn't officially been on tour since her Back to Basics concert series wrapped up toward the end of 2008 (TEN YEARS, XTINA?!), but she finally took her show on the road again Monday night (April 23) as the latest celebrity to belt her way through James Corden's famous "Carpool Karaoke" segment on The Late Late Show.

In the clip below, the consummate vocalist puts on a showcase with hits like "Fighter," "Dirrty," "Beautiful" and "Genie in a Bottle." More importantly, though, she dishes out secrets about Britney Spears, Justin Timberlake, Ryan Gosling and more former fellow Mickey Mouse Club cast mates.

Aguilera, Spears, Timberlake, Gosling and more of today's biggest stars appeared on The All-New Mickey Mouse Club between 1989 and 1994.

Corden, a straight-shooter, considers that Aguilera — like the rest of humankind — must have had a crush on Gosling, but she quickly refutes the claim.

"I think there were crushes, but I wasn't on the train," she says. "But [Timberlake] had swag, I have to say."

And then, she drops a bomb.

"Ryan, he did have a crush on Britney, it was so cute," she says. "But she got Justin!"

"Oh yeah, that worked out wonderfully," Corden jokes.

"Well, hit songs, right?" Aguilera contends.

And just when you thought you knew it all...

And then, Melissa McCarthy joins out of nowhere for an official lesson in becoming a diva. Words cannot do it justice — check out the moment for yourself above.

Christina Aguilera's Most Outrageous Looks:

More From 104-5 KDAT