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Justin Timberlake raved to Ellen DeGeneres on Thursday about marrying his "best friend," Jessica Biel.

“Every once in a while I can catch a glimpse of her when she doesn’t see me looking, and I have this moment where I’m like, ‘If you never make a good decision … if you only make bad decisions for the rest of your life, you made one really good decision,’” he said, adding, “It’s nice to marry your best friend. It suits me.”

SODAHEAD SLIDESHOW: See the most in-love celebrity couples.

Aw... but JT and Biel aren't the only too-cute couple in Hollywood. DeGeneres' own wife, Portia de Rossi, told the May issue of Out magazine: "Married life is blissful, it really is. I’ve never been happier than I am right now."

If you have any doubt that Beyoncé and Jay-Z are "Crazy in Love," just watch her documentary, "Life Is But a Dream." They even sing Coldplay songs to each other ...

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Kate Middleton and her Prince seem like the real deal, and they're even cuter with a (royal) baby on the way. We really hope this one lasts.

Brad Pitt and Angelina Jolie: Are these two still madly in love, six kids later? Well, they're always on the verge of getting married, so that's a good sign. That said, why haven't they done it yet? Or have they??

Pitt and his ex-wife Jennifer Aniston have something in common — they both seem to have cold feet. A recent report said Aniston and Justin Theroux have also postponed their wedding, but are still "madly in love." They certainly look happy ...

Last October, Olivia Wilde bragged about her fiancé Jason Sudeikis to Glamour, saying she was "blissfully, hopefully, wildly in love." She also boasted that she and Sudeikis "have sex like Kenyan marathon runners." Lucky guy ...

And believe it or not, Chris Brown and Rihanna are still a thing. Within a week or so of declaring their relationship over, Breezy and RiRi were posting cutesy selfies. It's not the healthiest relationship, but they clearly can't say goodbye ...

PHOTOS: See the latest celebrity pictures to hit the Internet.

Let us know: Who do you think is the most in-love celeb couple?