You guys, chill. He's just sampling her song. Considering the fact that they're signed to the same record label, someone at IDJ probably suggested it (and most likely the sample is from "Sanctuary" since that's the one IDJ actually has rights to). As long as all of the royalties have been paid to the right people, there's nothing illegal about it and he hasn't stolen anything.

Most artists don't actively identify the music they sample, but rest assured, if it was used legally Hikki will be credited somewhere in the album liner notes for that song.

So relax~.