Supermodel Naomi Campbell has revealed she 'only really eats once a day'.

The star, who turns 50 next month, has dinner at lunch time - and that's it.

According to The Sun, Naomi said: 'I eat my lunch. Lunch is my dinner, because I really only eat once a day.'

Lunch is served: Supermodel Naomi Campbell has revealed she 'only really eats once a day'

Speaking about what she does on 'treat day' Sunday, she said: 'Sunday is my treat, so I’ll make desserts, my cakes and puddings.'

Naomi refrains from using dairy and gluten in her cooking, and has admitted in the past to fasting for days prior to a fashion show.

'I eat when I feel like it and I don’t starve myself. If I want to do a day of just not eating, I do it and just do water or juice. Depends how I feel. In the heat, sometimes I just want to do juice.

One meal a lady: The star, who turns 50 next month, has dinner at lunch time - and that's it

'It’s never planned. It could be one day, it could be two days a week. It’s just when I feel like doing it.'

On Monday, Naomi took part in an Instagram Live with Serena Williams - who joked she's never heard of Meghan Markle before, despite attending her wedding to Prince Harry two years ago.

The tennis ace got tongue-tied and coy when Naomi asked her if she was happy Meghan had relocated to live with Harry and son Archie in Los Angeles.

Meghan who? On Monday, Naomi took part in an Instagram Live with Serena Williams - who joked she's never heard of Meghan Markle before, despite attending her wedding to Prince Harry two years ago

'I don't know what you're talking about, don't know nothing about that,' Serena, 38, responded, trying to shut down the direction of the conversation.

When Naomi, laughing, pressed her on it again, she said: 'Never seen her, never heard of her, don't know her.'

Serena and her sister Venus Williams joined the model for an episode of her No Filter with Naomi series on YouTube.

Wouldn't be drawn: 'Never seen her, never heard of her, don't know her,' Serena said as Naomi giggled and sister Venus Williams kept a poker face

Big pals: The tennis champ and the actress first met at a Super Bowl party in Miami in 2010 and got their picture taken together when they teamed up at a 2014 Super Bowl event in NYC

VIPs: Serena and husband Alexis Ohanian were guests at Meghan's May 2018 wedding to Prince Harry in Windsor, England

The conversation also centered a lot on fashion with Serena revealing that Vogue Editor-in-Chief Anna Wintour had insisted on helping her with her wedding dress when she tied the knot with Reddit co-founder Alexis Ohanian.

'You know she’s a special person, and I absolutely completely adore her. And I love being around her,' Serena said of Wintour.

'First of all, she’s like, ‘you’re not getting this without me’ and I’m like ‘OK’. Every single sketch and design we sent to her and she gave great feedback, and I’m like ‘Oh my god you’re so right, that would be really cool and really good’. It was really, really awesome.'

Fashionistas: Serena did gush about her friendship with Vogue Editor-in-Chief Anna Wintour calling her 'a special person' whom she adores. The pair are pictured in Milan in 2016

Tips: Serena revealed Wintour advised her on her wedding dress ahead of her marriage to Ohanian, saying: 'Every single sketch and design we sent to her and she gave great feedback'

Serena married Ohanian in November 2017 following the birth of their daughter Olympia.

It's believed that she first met Meghan back in 2010 at a Super Bowl party in Miami, Florida.

In 2017, the tennis superstar revealed to Vanity Fair that the actress had sought her advice about dealing with the paparazzi after news of her romance with Harry went public.

'I told her, ‘You’ve got to be who you are, Meghan. You can’t hide',' Serena said.

Meghan has also supported Serena at Wimbledon and the US Open, making sure to be in the stands to cheer the champ on.

Following their decision to step down as senior members of the Royal Family on March 31, Meghan and Harry moved from Canada, where they'd been living for six months, to Los Angeles where the former Suits actress was raised.

Serena, too, was raised in LA but now resides in Palm Beach, Florida, with her husband and daughter.