To Love Ru
To LOVEる -とらぶる- (original)
Rito Yuki had no idea the planet Develuke even existed when their Princess Lala teleported into his bathtub, but now he finds himselft to be engaged to the beautiful girl with a pointed tail. Problem: various aliens are showing up on missions of varying hostile intent. Worse, the girl that Rito REALLY loves is still completely unaware of his feelings!
Starring Ayako Kawasumi, Kaori Nazuka, Aki Toyosaki, Ryoka Yuzuki, Kanae Ito
Watch "To Love Ru" on Hulu Plus released in 2008. It's a animation and comedy show, and has a rating of 6.4 out of 10 from Imdb which is usually fine for this kind of show.