Naomi Watts and Billy Crudup walk down the aisle in a lavish ceremony in Mexico City... a year after their courthouse wedding

Naomi Watts and Billy Crudup walked down the aisle Saturday, again.

The couple, who tied the knot in a simple courthouse ceremony last year, said 'I do' for the second time, almost a year to the date of their first wedding.

This time around, the pair threw a lavish ceremony and reception for family and friends in Mexico City.

Video shared on social media by Watts' brother Ben, shows the Feud star, 55, wearing a simple but elegant sleeveless off-white gown with a deep V-neck and a belted waist and she and the wedding party waved from the elevator on the way to the ceremony.

The Watcher star carried a bouquet of white anemone.

Her blonde hair was styled in a low bun with tendrils framing her face.

The Oscar nominee's makeup looked camera ready with a soft pink lip.

Crudup, 55, looked handsome in a traditional black suit. 

Watts' child Kai, 15, and niece Ruby were bridesmaids, and they wore strapless champagne colored gowns with ruching at the waist.

Both teens styled their hair straight and pulled back in half ponytails. 

Also in the wedding party were Watt's son Sasha, 16, and Crudup's son William, 20. Both were styled in dark suits.  

Watts shares both her children with former partner Liev Schreiber, 56. Crudup shares William with ex-partner Mary Louise Parker, 59. 

Ben Watts shared an Instagram Story video showing proud mom Myfanwy Edwards Roberts getting emotional before the ceremony. 

The bride's best friend Nicole Kidman attended the lavish ceremony that appeared to take place at a museum. 

The Faraway Downs actress was spotted sitting with friends before the ceremony wearing a sparkling silver long sleeve top and a short black skirt.

Her strawberry blonde hair was styled in loose waves. 

Other guests included Justin Theroux and girlfriend Nicole Brydon Bloom. 

Destination Wedding, Event & Travel Planner Billy Folchetti also shared some black and white photos of the reception hall before the guests arrived in his Instagram Stories.  

Video from the rehearsal dinner the night before shows Watts in a gorgeous yellow dress with floral print.

During a speech, the bride-to-be held her groom's hand and told their guests, 'This is a reminder of what life's about, the affirmation of love. It's one of the simplest things, but one of the most important.'