Belting her way through such classics as Fighter, Genie in a Bottle and Beautiful, Xtina proved just how good a vocalist she is in the nine-minute video that has already been watched by nearly half a million people.
Christina even managed to fit in a vocal lesson with James who was dying to learn how to achieve that raspy tone that she is well-known for.
And the pair weren't alone either.
They were joined by a very special guest in the form of Melissa McCarthy who appeared just in time to recreate Redman’s rap verse from the hit Dirrty.
The video reminded us of two things - how many absolute bangers Christina has in her back catalogue and how bloody talented she is too.
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