Two music questions

First of all...hey. I'm new here. "Favorites" lists are bullshit and tend to embarrass after a few months pass, so none of that. Love music, though, and excited about adding yet more to the interminable "albums I must buy" file.

'Kay. Questions.

#1: There is a female singer from Brazil whose name is pronounced something like "Sevala Shiek." It's spelled completely differently, though, because I don't speak Portuguese. Anyone know who she is?

#2: There's a pop song that's really popular in Spain (and maybe other Spanish-speaking countries; I don't know). Its chorus has the line "boom boom boom en mi corazon" in it. And it's really fun/catchy. Any ideas on the title/artist/whereImightfindit?

Thanks!

Sophia