However in Hawaii, another of the sport's biggest players was celebrating a different type of big day - and a far more intimate one at that!
UFC star-turned-actress Ronda Rousey, 30, officially tied the knot with Furious 7 star Travis Browne, 35, in a super secret ceremony in Hawaii, and has shared some stunning photos from the laid-back occasion for fans.
The happy couple beam in a black and white image by Rousey's personal photographer Michael Mardone, which shows them walking hand-in-hand with a garland of greenery over the groom's shoulders.
In another photo, Browne poses as if struggling to lift his wife, who was the first American woman to earn an Olympic medal in judo, which she won at the 2008 Summer Olympics in Beijing.
The bride wore a beautiful beaded Galia Lahav gown, which featured a plunging neckline and soft, chapel-length train.
Groom Travis opted for a more relaxed look with a loose-fitting linen shirt and light coloured trousers.
"What an amazing day!!," the groom wrote on his photo announcing the nuptials. "She is so perfect in every way! She makes me so happy! She is my other half! I Love You @rondarousey ".
The couple got engaged on holiday in New Zealand earlier this summer, leaving just weeks to plan their bohemian style big day.
"We're going to do, like, a backyard Mexican, Corona party, but in Hawaii," the bride announced as she spoke all about her big day plans on US talk show Live! with Kelly and Ryan.
It's the first marriage for Rousey and second for Browne who was previously married to fitness model Jenna Webb.
PSST! Love Ronda's dress? It's by Israeli bridal designer Galia Lahav. Galia Lahav is stocked in Ireland by Myrtle Ivory, based in Dublin, who will hold a trunk show for the designer on 1st and 2nd September 2017. Visit myrtleivory.com for details and check back with THEVOW.ie for more fabulous wedding fashion news!