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Mariah Carey, Nick Cannon, Monroe, Moroccan

Courtesy: Bill Boatman

Talk about going all-out for your first birthday!

Mariah Carey and Nick Cannon's twin babies, who turned one yesterday, celebrated their first year of life with a very elegant and sophisticated gathering—in Paris.

Monroe and Moroccan partied in style with their parents and several close friends at the Plaza Athenee in the City of Light—where their mom and dad renewed their vows—on Sunday.

The memorable occasion was complete with custom-made French pastries and loads of balloons, toys and confetti to make the get-together as festive as possible.

Mariah—who performed a concert in Austria yesterday—tweeted, "Singing at this altitude is almost like giving birth to twins, which I did last year on this day.. lol! Happy birthday dembabies!!"

Hubby Nick Cannon also posted on Twitter Monday, saying, "One of the happiest days of my life! Watching my wife on stage on our 4th anniversary & celebrating our kids 1st birthday! On a Jet home!"

Sounds like one memorable weekend.