Christina Aguilera has a "special bond" with Sabrina Carpenter

She told People: "I've grown such a special bond with Sabrina over the past few months and truly love seeing her kill it out there. I have so much respect and love for what it takes to uphold the schedule and the touring demands that pop star life comes with.

"Her poise and composed stamina is always a pleasure to work with, and we always have so much fun together. It's an easy connection.

"The fans have been so incredible as well, adding so much love to all we do together! I love loyal ones who ride for their queen, so it's been lovely to witness and it warms my heart!"

Christina made a surprise appearance at Sabrina's recent show in Los Angeles where she performed her 2000s hits 'Ain't No Other Man' and 'What a Girl Wants'.

Meanwhile, 'Espresso' hitmaker Sabrina has previously expressed her own admiration for the 'Burlesque' actress and recalled being influenced by one of her early performances as a child.

Speaking to Christina in a YouTube video, Sabrina said: "I think the first time I ever heard your voice was [when] my mom played me a video of you singing at eight years old, 'A Sunday Kind of Love'.

"That was the most inspiring thing for me ever to see as a young girl that wanted to sing, but just didn't think I could do it at that age."