I’m kind of curious if she could sing the Spanish part live too.It just seemed so flawless in the video when she sang it but I’m sure it’s probably not easy to master.The song is amazing in itself but her singing in Spanish was mind blowing& shocking all at the same time.It’s just jarring to hear her sing in a language that we’ve never heard her sing in before.
Spanish isn't actually difficult to sing. Remember that in the studio she had the lyrics in front of her and in the video she only needed to look convincing enough.
Unlike English, Spanish is a completely phonetic language so with help in the studio, as everyone does, she could just do it phonetically. I think I read that Christina Aguilera doesn't actually speak Spanish (her father's from Ecuador) and she released a full Spanish album. Unless the song goes really, really quickly with a lot of syllables swallowed up like the Mexican national anthem does, it really isn't that difficult in the studio. Don't forget that you can record word by word in the studio as well.
But live, yeah. She'd have to memorize the sounds by heart. But she's a perfectionist so my guess is that she probably already did even just for the studio recording.