Elon Musk looks carefree as he enjoys a day boating in Mykonos with girlfriend Sarah Staudinger

He recently revealed that he fathered ten children with three different women.

And on Friday, Elon Musk, 51, looked carefree as he enjoyed a day out on the boat with girlfriend Sarah Staudinger and her new husband, Endeavor CEO Ari Emanuel, while on vacation in Mykonos, in Greece.

The multi-millionaire businessman arrived on the popular Greek island with a group of friends, including Sarah, who sported a stunning yellow ensemble.

Elon Musk, 51, looked carefree as he enjoyed a day out on the boat with his girlfriend Sarah Staudinger – the new wife of Endeavor CEO Ari Emanuel – while on vacation in Mykonos, Greece on Friday. .

The SpaceX founder and Tesla CEO kept things casual in a plain green/gray t-shirt and black swim shorts, with a classic aviator pair shielding his eyes.

Meanwhile, her pal Sarah commanded attention in a skimpy yellow crossover bikini top paired with a matching tight skirt.

The American fashion designer flaunted her washboard abs in the colorful coordinated set and finished her look with a sleek beach bag and cat-eye sunglasses.

Elon and his friends had a meal at Spilia Seaside Restaurant before taking in the view of the picturesque island on their private boat.

Fun with friends: The multimillionaire businessman arrived on the popular Greek island with a group of friends, including the mysterious brunette dressed in yellow

Fun with friends: The multimillionaire businessman arrived on the popular Greek island with a group of friends, including the mysterious brunette dressed in yellow

Gorgeous: Sarah caught the eye in a yellow criss-cross bikini top

Gorgeous: Sarah caught the eye in a yellow criss-cross bikini top

Fashionista: She paired the bikini top with a matching tight skirt

Fashionista: She paired the bikini top with a matching tight skirt

Gorgeous: Sarah caught the eye in a skimpy yellow criss-cross bikini top paired with a matching tight skirt

Chatty: Sarah was seen socializing with the Tesla CEO during the outing

Chatty: Sarah was seen socializing with the Tesla CEO during the outing

Chatty: Sarah was seen socializing with the Tesla CEO during the outing

Keep it casual: SpaceX founder and Tesla CEO kept things casual in a plain green/gray t-shirt

Keep it casual: SpaceX founder and Tesla CEO kept things casual in a plain green/gray t-shirt

Ready for the sun: He wore black swim shorts, with a classic aviator pair shielding his eyes

Ready for the sun: He wore black swim shorts, with a classic aviator pair shielding his eyes

Keeping it casual: The SpaceX founder and Tesla CEO kept things casual in a plain green/gray t-shirt and black swim shorts, with a classic aviator pair shielding his eyes

Jokers: The group all smiled as they shared a laugh as they made their way to shore

Jokers: The group all smiled as they shared a laugh as they made their way to shore

Jokers: The group all smiled as they shared a laugh as they made their way to shore

Stunning: Sarah - who married Ari last month - seemed to be in high spirits as she chatted with Elon

Stunning: Sarah - who married Ari last month - seemed to be in high spirits as she chatted with Elon

Stunning: Sarah – who married Ari last month – seemed to be in high spirits as she chatted with Elon

In March, it was reported that Elon was in an “on-off” relationship with Australian actress Natasha Bassett, 27, after meeting on the Los Angeles social scene.

Confidential reported that the couple, who were spotted disembarking from Elon’s private jet after his plane landed in Los Angeles in February, have known each other for some time.

“Elon and Natasha have had an on-going relationship for a few years,” an alleged source told Confidential.

“I think their relationship is quite tumultuous, especially with him having the same kind of on-and-off, on-going relationship with Grimes.”

Daily Mail Australia has contacted Elon Musk for comment.

Well placed: Sarah enjoyed the chats with Elon during the sunny outing

Well placed: Sarah enjoyed the chats with Elon during the sunny outing

Well placed: Sarah enjoyed the chats with Elon during the sunny outing

Happy days: Tesla boss looked delighted to chat with his girlfriend Sarah

Happy days: Tesla boss looked delighted to chat with his girlfriend Sarah

Listen: he gave her his ear as she chattered

Listen: he gave her his ear as she chattered

Happy days: Tesla boss looked delighted to chat with his girlfriend Sarah

Wow! The American fashion designer flaunted her washboard abs in the colorful matching set

Wow! The American fashion designer flaunted her washboard abs in the colorful matching set

Wow! The American fashion designer flaunted her washboard abs in the colorful matching set

Glam: Sarha was glamorous to the max for the day in Mykonos

Glam: Sarha was glamorous to the max for the day in Mykonos

Glam: Sarha was glamorous to the max for the day in Mykonos

In May, Elon and Natasha were spotted having dinner at the Cheval Blanc hotel in Saint-Tropez, where rooms cost over $1,300 a night.

And at the time it seemed that she had been well and truly embraced by Elon’s family, attending several events in Cannes where her model mother Maye was also a guest.

The couple thought they had attended the premiere of Bassett’s new movie, Elvis. She plays one of the singer’s girlfriends in the biopic.

The actress left Australia for the United States when she was 19. She first worked in New York, then moved to Los Angeles. It’s unclear how she and Musk met.

Yes! Elon threw his hands up as they sailed to the island

Yes! Elon threw his hands up as they sailed to the island

Yes! Elon threw his hands up as they sailed to the island

Skipping: Elon eagerly followed the Sarah of their offer as they continued their day

Skipping: Elon eagerly followed the Sarah of their offer as they continued their day

Continued on: He followed her to dry land after the boat trip

Continued on: He followed her to dry land after the boat trip

Skipping: Elon eagerly followed the Sarah of their offer as they continued their day

Tidying up: Elon tidied up before getting off the small boat

Tidying up: Elon tidied up before getting off the small boat

Tidying up: Elon tidied up before getting off the small boat

Fun times: Tesla CEO looked happier than ever while vacationing in Mykonos

Fun times: Tesla CEO looked happier than ever while vacationing in Mykonos

Fun times: Tesla CEO looked happier than ever while vacationing in Mykonos

Easy Breezy: Elon looked relaxed on the sunny day in Greece

Easy Breezy: Elon looked relaxed on the sunny day in Greece

Easy Breezy: Elon looked relaxed on the sunny day in Greece

Earlier this month, Elon tweeted, “Doing my best to help the underpopulation crisis,” he intoned. “A collapsing birth rate is by far the greatest danger facing civilization.”

He added: “I hope you have great families and congratulations to those who already have!”

His tweet came when it emerged that last November he had quietly welcomed twins with Shivon Zilis, 36, a senior executive at one of his companies.

What’s more, they arrived just weeks before Musk had a second child via surrogate with his on-and-off girlfriend Claire Boucher, aka Canadian pop star Grimes.

Strike a pose! Sarah appeared to be in jovial form as she gave a peace sign while a friend took a picture

Strike a pose! Sarah appeared to be in jovial form as she gave a peace sign while a friend took a picture

Strike a pose! Sarah appeared to be in jovial form as she gave a peace sign while a friend took a picture

Stylish: The brunette finished her look with a stylish beach bag and cat-eye sunglasses as she stepped off the boat with hubby Ari

Stylish: The brunette finished her look with a stylish beach bag and cat-eye sunglasses as she stepped off the boat with hubby Ari

Stylish: The brunette finished her look with a stylish beach bag and cat-eye sunglasses as she stepped off the boat with hubby Ari

Center of attention: Unsurprisingly, Elon got attention during his day

Center of attention: Unsurprisingly, Elon got attention during his day

Center of attention: Unsurprisingly, Elon got attention during his day

Adventure time: the group was taken for a meal before taking a ride on the boat

Adventure time: the group was taken for a meal before taking a ride on the boat

Adventure time: the group was taken for a meal before taking a ride on the boat

Musk’s two children with Grimes are two-year-old son X Æ A-Xii (pronounced “X-Ash-A-12”) and seven-month-old Exa Dark Sideræl. They are called X and Y for short.

The Tesla mogul also has five children with his first wife, Canadian author Justine Musk.

A sixth child, their first, died of sudden infant death syndrome at the age of ten weeks in 2002, prompting them to resort to in vitro fertilization. Then Justine gave birth to twins – Vivian and Griffin – in 2004, followed by triplets – Kai, Saxon and Damian – in 2006.

An ex affair? In March, it was reported that Elon was in a relationship

An ex affair? In March, it was reported that Elon was in a relationship

An ex affair? In March it was reported that Elon was in an ‘on-off’ relationship with Australian actress Natasha Bassett, 27 (pictured together in France on May 26)

Life in pink! In May, Elon and Natasha were spotted having a meal at the Cheval Blanc hotel in St Tropez, where rooms cost over $1,300 a night.

Life in pink! In May, Elon and Natasha were spotted having a meal at the Cheval Blanc hotel in St Tropez, where rooms cost over $1,300 a night.

Life in pink! In May, Elon and Natasha were spotted having a meal at the Cheval Blanc hotel in St Tropez, where rooms cost over $1,300 a night.

. Elon Musk looks carefree so he enjoy dune day boat Mykonos with girlfriend Sarah Staudinger

. Elon Musk carefree enjoys day boating Mykonos girlfriend Sarah Staudinger

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