Kai Trump plays golf with unrecognizable former child star with a very famous sister

Kai Trump, the granddaughter of President Donald Trump, teed it up with a player who is no stranger to the spotlight. 

The First Granddaughter continued to expand her YouTube channel, which already boasts 1.33 million subscribers, with her latest video earlier this month. 

The 18-year-old, who has shared a range of content from lifestyle vlogs and cooking challenges to behind-the-scenes of the presidential family, returned to her golfing roots. 

Taking inspiration from two-time major winner Bryson DeChambeau's 'Break 50' series, Kai attempted to shoot under 30 over nine holes with her friend, Allan Kournikova. 

Playing at their home course, the pairing didn't quite manage to achieve their goal. Instead, they had to settle for a score of 31, which was five-under-par for the nine-hole stretch. 

When they realized the feat was impossible through six holes, the duo jokingly switched the challenge to 'Shoot 30,' which they also didn't manage.  

The pair appear to be close friends with Allan even attending the president's inauguration in January. He shared a photo with Kai dressed for the inauguration ball. 

He also revealed during the video that he has even caddied for Kai on a number of occasions. 

Allan's last name may have been familiar to a number of viewers thanks to his famous sister, tennis sensation Anna Kournikova. 

At just 21, Allan has already made a name for himself. Following in his famous sister's footsteps, he proved to be a sporting prodigy at a young age.

Allan, who is the half brother of the former tennis ace, first picked up a golf club at 18-months-old and began playing competitively at age five, racking up more than 200 trophies before the age of 10.

The Palm Beach resident's success garnered the attention of Netflix as he became one of the junior golfers profiled in the documentary, 'The Short Game.'

The film followed the world's best seven-year-old golfers as they traveled to Pinehurst, North Carolina to compete in the World Championships of Junior Golf.

Along with the documentary's other stars, Alexa Pano, and Sky Sudberry, Allan appeared on Jimmy Fallon's 'The Tonight Night Show' where they challenged the hosts to a chipping contest.

Anna has previously shared touching posts about her half brother expressing her pride in his sporting achievements, while Allan posted a photo with Anna's husband, Enrique Iglesias, over summer. 

Allan and tennis star Anna share a mom, Alla, who made headlines for the wrong reasons in 2012 when she was arrested for child neglect. 

Alla reportedly left a then five-year-old Allan home alone at their $2.2 million Palm Beach mansion to run errands. She said that she had placed him in front of the television, but the youngster wandered up to the second floor of the home where he jumped from a window. 

Anna, who is currently expecting her fourth child with Spanish singer Iglesias, burst onto the scene in the tennis world when she turned professional at the age of 14.

She got as high as eighth in the world rankings but never won a Grand Slam singles title.

But in the doubles, she enjoyed greater success once she partnered up with Martinia Hingis. Together, they won the Australian Open doubles championship in 1999 and again in 2002. 

Anna's rise was blighted by stress fractures in her back and feet - her foot injuries meant that there was extra concern when she was pictured in a protective boot earlier this year, considering her history.

She never officially confirmed that she had retired but her last game was in May 2003 when she was just 21 years old - two years after she met Iglesias on the set of the music video for his 2001 hit, 'Escape.' 

She also enjoyed the spotlight away from the court, garnering fame as a model. In 2002, she was voted the world's sexiest woman, beating the likes of Britney Spears and Jennifer Lopez, and was also acknowledged as the sexiest female tennis player of all time in 2010.