It’s from the deleted shower scene. If you can see it on the official site, it’s here: https://www.lasestrellas.tv/telenovelas/amar-a-muerte/clip/exclusiva-juliana-y-valentina-hacen-el-amor-sin-censura
Else: http://booasaur.tumblr.com/post/182280647992/amar-a-muerte-1×56-deleted-shower-scene