Hi Frank,
Do you want to know the tagalog translation of this? Actually there's no literal translation for this english expression, but maybe, we can translate "you rock my world" this way:
* pinaliligaya mo ang buhay ko (you're making my life happy)
* binibigyan mo ng kulay ang buhay ko (you're giving my life full of colors)
* kinukumpleto mo buhay ko (you complete me/my life)
or maybe with a colloquial translation:
* buhay na buhay ako sa iyo (i feel alive when i'm with you - lol).
I hope this little translations can help you.....