They only made their debut as a couple at the Australian Open earlier this month.

But Venus Williams, 37, set tongues wagging when she was pictured sporting an eye-catching diamond band on her ring finger as she walked through Sydney Airport with her millionaire boyfriend Nicholas Hammond, 25, on Tuesday.

The tennis ace beamed as she wandered through the terminal, concealing her hand under a large straw hat as she was joined by her mother Oracene Price, 65, and sister Isha, 42.

Scroll down for video

Speculation: Venus Williams, 37, sported an eye-catching diamond band on her ring finger as she walked through Sydney Airport with boyfriend Nicholas Hammond, 25, on Tuesday

A representative for Venus confirmed to MailOnline the pair are not engaged.

Opting for a casual ensemble to complement her sparkling jewellery, she donned a pair of skintight black leggings which accentuated her slender frame.

The seven-time Grand Slam winner teamed her pin-flaunting pants with a grey hoodie that featured fleece lining as she hid her ring-clad hand out of view.

Venus attempted to go incognito as she walked through the terminal, covering her hair with a colourful baseball cap and holding a beach hat over her ring finger.

The US sports star appeared in jovial spirits as she waited at check-in resting her diamond-clad hand on her hip.

Eye-catching: The US sports star appeared in jovial spirits as she waited at check-in resting her diamond-clad hand on her hip

Flash: Opting for a casual ensemble to complement her sparkling jewellery, she donned a pair of skintight black leggings which accentuated her slender frame

Captivating: Her ring popped against her muted ensemble as she navigated her way through the international airport after Australian reports claimed that Nicholas proposed to her at an idyllic beach house on Sunday

While all eyes were on her sparkling hand, Venus’ beau Nicholas donned a wine-coloured T-shirt ahead of their long-haul flight.

Ring-ing the new year: The eye-catching ring featured two diamond stones across a double band

He teamed the piece with a pair of dark wash denims and opted to sport a pair of shades while walking through the airport.

This is only one of a handful of times the couple have been spotted together, with tennis ace Venus debuting her handsome millionaire boyfriend at the Australian Open.

Venus was last seen with Nicholas in November in New Orleans, where she attended her sister Serena’s wedding to Reddit co-founder Alexis Ohanian. They held hands as they walked through the city.

Family affair: The tennis ace beamed as she wandered through the Australian terminal covering her glittering hand under a large straw hat as she was joined by her mother Oracene Price, 65, and sister Isha, 42

Beaming: In her ring-free hand, beaming Venus carried a small brown paper bag and held a near empty juice cup in the crease of her arm

And according to PageSix, they looked happy at a December dinner in NYC.

‘They were cuddled up the entire time they were inside the restaurant, even kissing while waiting to be seated and continuing the affection at their table,’ said a source.

Hammond is an heir to Walter Annenberg’s TV Guide fortune. ‘He’s a wealthy financier who goes between California and New York,’ said a friend.

And sources tell the site he is no ‘gold digger’ as he has plenty of money of his own. Their 12-year age difference doesn’t bother him either.

Although notoriously private, the pair are ‘head over heels for each other’ according to PageSix.

Out of hand: The seven-time Grand Slam winner teamed her pin-flaunting pants with a grey hoodie with fleece lining as she decidedly hid her ring-clad hand out of view

Venus attempted to remain incognito as she walked through the terminal, covering her hair with a colourful baseball cap and holding a beach hat over her ring finger

The publication also reported that the tennis star and muscular hunk have regularly meet up in Palm Beach, Florida over the past several months.

‘Nicky has met up with Venus in Palm Beach, where his family has a $20 million mansion as well as in the Hamptons, where they have a $20 million house,’ said the source.

And it has impressed her that he has not bragged about his relationship with the athlete. ‘She likes that he’s very private,’ added the source.

Venus has previously dated model Elio Pis, 29, for a year after they met in 2012 when he modelled for her EleVen fashion line.

Hats on: Venus attempted to remain incognito as she walked through the terminal, covering her hair with a colourful baseball cap

Relaxed: While all eyes were on her sparkling hand, Venus’ beau Nicholas donned a wine-coloured T-shirt ahead of their long-haul flight

Prior to her romance with the hunky Cuban, Venus was in a serious relationship with golfer Hank Kuehne for three years before they broke up in 2010 and he went on to marry his second wife Andy in 2011.

The sighting comes after her younger sister Serena Williams welcomed her first child Alexis Jr. in September with husband, Reddit co-founder Alexis Ohanian.

Earlier this month, she revealed candidly revealed that she was plagued by health problems and almost died after she welcomed daughter into the world four months ago. 

She wrote on Facebook, though, that the whole ordeal has given her strength and ‘made me appreciate women — both women with and without kids — even more.’

Happy: He teamed the piece with a pair of dark wash denims and opted to sport a pair of shades while walking through the airport

Handful: This is only one of a handful of times the couple have been spotted together, with tennis ace Venus debuting her handsome millionaire boyfriend at the Australian Open

Romance: Venus was last seen with Nicholas in November in New Orleans, where she attended her sister Serena’s splashy wedding to Reddit co-founder Alexis Ohanian. They held hands as they walked through the city

The tennis champ shared: ‘I didn’t expect that sharing our family’s story of Olympia’s birth and all of complications after giving birth would start such an outpouring of discussion from women – especially black women – who have faced similar complications and women whose problems go unaddressed.’

She continued: ‘These aren’t just stories: according to the CDC, (Center for Disease Control) black women are over 3 times more likely than White women to die from pregnancy – or childbirth-related causes.

‘We have a lot of work to do as a nation and I hope my story can inspire a conversation that gets us to close this gap.

‘Let me be clear: EVERY mother, regardless of race, or background deserves to have a healthy pregnancy and childbirth.’

Serena, who married her baby’s father Alexis, in November added: ‘I personally want all women of all colors to have the best experience they can have.

Relationship: And according to PageSix, they looked happy at a December dinner in NYC

Sources: A source told the publication: ‘They were cuddled up the entire time they were inside the restaurant, even kissing while waiting to be seated and continuing the affection at their table’

‘My personal experience was not great but it was MY experience and I’m happy it happened to me.  It made me stronger and it made me appreciate women – both women with and without kids – even more. We are powerful!!!.’

She closed out: ‘I want to thank all of you who have opened up through online comments and other platforms to tell your story. I encourage you to continue to tell those stories. This helps. We can help others. Our voices are our power.’

Covering the February issue of Vogue with her baby, Serena revealed inside that small blood clots were discovered on her lungs soon after she gave birth.

A pulmonary embolism resulted in bouts of coughing so severe that her cesarean wound reopened. She was dealt with another blow when doctors discovered a large hematoma and she was bedridden for six weeks.

Past: Hammond is an heir to Walter Annenberg’s TV Guide fortune. ‘He’s a wealthy financier who goes between California and New York,’ said a friend

Support: The sighting comes after her younger sister Serena Williams welcomed her first child Alexis Jr. in September with husband, Reddit co-founder Alexis Ohanian