Aguilera, 43, strutted into the venue, wearing a black bustier and over-the-knee silver boots while performing a vocal riff that launched a rendition of “Ain’t No Other Man.” Carpenter, 25, subsequently joined her at center stage to complete the number, per social media footage. They also sang Aguilera’s “What a Girl Wants.”

Fresh from being nominated for half a dozen Grammy Awards, the 25-year-old pop star brought her tour behind this year's "Short n' Sweet" to Los Angeles on Friday night.