Let the Games begin! Celebrities at the 2016 Rio Olympics

His dad Michael Phelps might be the greatest Olympian of all time but Boomer Phelps (and his chubby cheeks) has become a star in his own right!

Michael’s beauty queen fiancee Nicole Johnson brings Boomer along to each and every one of his dad’s Olympic races! The mother-son duo have become the swimmer’s ultimate cheer squad.

Nicole and Michael, who have been engaged since February last year, have even set up an Instagram account for their son! Little Boomer has quickly amassed thousands of fans. At current count, the bub has 563K Instagram followers. Move over, Michael! Watch Michael talk about fatherhood in the next slide. Gallery continues after the video

Zac Efron shared this court-side snap from Rio.

Prince Fred quickly fixes his tie ahead of a medal presentation. Fred was lucky enough to hand out the silver medal to Denmark’s Greco-Roman wrestler, Mark O. Madsen.

Princess Mary and her husband Prince Frederik couldn’t have been more excited as they immersed themselves in the spectacular that was the 2016 Rio Olympics Opening Ceremony.

The royal couple have been living their best lives in the seaside city of Brazil, making their way from event to event and stopping to greet a few furry friends along the way.

Mary let her love of horses shine through upon visiting Danish dressage rider Mie Poulsen and her horse Cassidy.

“I’ll absolutely support Australians,” the mother-of-four declared to The Today Show in preparation for the coveted event. “So long as they’re not competing against a Dane,” she added. Watch the sweet footage in the next slide!

Lleyton Hewitt and his little ones, Cruz and Ava are voicing their support all the way from Australia for Rio Olympic hopeful, Georgia Baker. The proud dad and his kids donned the green and gold and Georgia-themed shirts as they wished the cyclist all the best for her upcoming race. “Good luck @georgiabaker_ riding for @ausolympicteam in Rio #gtrain @wsportsandmedia #SwissePoweringDreams,” he captioned the sweet snap.

Matthew McConaughey and his wife Camila Alves have been slaying their Olympic attendance.

The Brazilian-born beauty is currently working as NBC and E!’s Lifestyle Correspondent throughout the Games. And clearly the Oscar-winner is loving being his wife’s sidekick! Check out his chat with Sunrise in the next slide…

Just a casual high-five with a fan…

The Texan actor might be feeling alright, alright, alright about the games… but clearly he has his eyes set on something better than a gold medal!

Twitter went a-flurry when they soon realised, that due to Camilla’s work commitments, the True Detective actor had to watch some of the races by his lonesome.

“Guys, there’s a seat RIGHT next to me!” We’re guess Camilla will be rewarding her hubby with some delicious home cooked food, telling E!, “[Matthew] loves my mother’s feijoada [a traditional Brazilian bean and meat stew].”

“This is for sure the longest runway I have ever walked in my life and by far with the most amount of people watching, so it is a little nerve-racking I must say,” Gisele Bundchen told People of her final catwalk across Maracanã Stadium. Watch the iconic model take the stage in the next slide!

Brazilian Victoria’s Secret model, Alessandra Ambrosio, had the honour of carrying the Olympic torch ahead of the highly-anticipated Opening Ceremony.

World number 6 tennis ace, Venus Williams, shared this stunning snap of her looking over Rio’s picturesque mountains with the caption, “Good morning red, white and blue sky’s of #Rio #Olympics”

And her sister Serena, who is currently ranked the world’s number one, also couldn’t help but share a proud snap of her fellow US teammates.