Sabrina Carpenter Performs with Christina Aguilera at L.A. Concert

Sabrina Carpenter‘s rapidly approaching pop superstardom … but, she’s still showing love for a pop music G.O.A.T. — ’cause Christina Aguilera joined her onstage for a couple songs.

The “Espresso” singer was performing at Crypto.com Arena — formerly Staples Center — Friday night … when Christina came out for a surprise performance, and Sabrina played up the shock that many in the audience surely felt.

Watch the clip … SC’s got her hand over her mouth as Christina belts out several notes before beginning “Ain’t No Other Man.”

Sabrina quickly goes from stunned silence to singing with CA … and, the two almost look like twins with their bleached blonde hair and matching black outfits.

The two also reportedly sang “What A Girl Wants” together … so, it wasn’t just a one and done quickie for them.

Worth noting … this isn’t the first time Sabrina and Christina have sung together. They performed a similar duet back in September during a 25th anniversary celebration of Aguilera’s self-titled debut album.

Sabrina’s a huge fan of Christina BTW … recently revealing her mom played “A Sunday Kind of Love” — the song Aguilera performed on “Star Search” back in 1990 — for her when she was young, and it was an incredibly inspiring moment in her music journey.