Mariah Carey and Nick Cannon
Pascal Le Segretain/Getty
04/27/2012 at 07:30 PM EDT
They do – again!
Almost four years after their surprise wedding
in the Bahamas, Nick Cannon got down on one knee before Mariah Carey
in a vow renewal ceremony Friday night atop the Eiffel Tower.
In a photo shoot beforehand, Carey is beaming in a stunning white mermaid dress with spaghetti straps and a black bow at the waist as Cannon, in a white suit and black tie, locks his eyes with hers.
"Tonight was an incredible night," the singer Tweeted.
"I can't express how amazing it was to renew our vows in Paris at the top of the Eiffel tower."
The couple have much to celebrate beyond their four-year anniversary, which falls on Monday. Along with enjoying nearly 1-year-old twins
, Cannon appears to be on the mend
from frightening health problems, including kidney disease.
After leaving the hospital in January, Cannon called Carey
his "hero" and "the virtuous person who is my angel." Carey returned the compliment by telling him he was her "incredible husband" who, despite his struggles, was still "all strong and healthy and big."
The couple arrived in France by private jet around 1 a.m. Friday. During the day, Carey was spotted shopping at Baby Dior – the couple's twins turn 1 on Monday – and at the Louis Vuitton flagship store on the Champs-Elysees.
Friday night, after they posed for their wedding renewal photos, the couple were spotted dining Le Jules Verne restaurant on the Eiffel Tower.