90 Day Fiancé star Deavan Clegg shared a heartbreaking update on son Taeyang (Picture: Instagram)

Deavan Clegg has revealed that she is going through ‘every parent’s absolute worst nightmare’, after her son was diagnosed with leukemia.

The star, who appeared on hit series 90 Day Fiancé, confirmed the news on Instagram, sharing photos of three-year-old Taeyang – who she shares with ex-husband Jihoon Lee.

In the pictures, he could be seen in his hospital bed, surrounded by machines and wires.

‘I have vowed to always be 100% transparent with you guys and I am choosing to share the most vulnerable and saddest point of my life right now in hopes it can help give anyone else dealing with a similar situation some strength,’ she began the lengthy caption.

‘I’m overcome with so much emotion and devastation to announce that my beloved son Taeyang who just celebrated his third birthday last week was just diagnosed with childhood cancer, b-cell acute lymphoblastic leukemia just a few days ago.

‘He has already undergone multiple procedures and started chemotherapy treatment just two days ago. This is every parents absolute worst nightmare and I’m trying hard to stay strong for Taeyang, Drascilla and my baby in my tummy.

‘Taeyang will need around the clock hospital care and this will be a long two year process that has a high success rate of full recovery in five years. I’m still processing all of this and asking for prayers, please.’

‘If anyone would like to donate to assist with his medical care, I would be forever grateful as this nightmare has been completely unexpected,’ she continued. ‘The link to donate is in my bio.

‘I will also create some kind of support fundraiser t-shirt this week too just still trying to wrap my head around all of this.

‘Also if anyone knows of any childhood cancer support groups and resources please tag them below. I’m so beside myself right now and my heart is broken. Thank you friends and supporters for your prayers, healing vibes and strength.’

Deavan completed the caption by adding the hashtags: ‘#leukemia #childhoodcancer #prayersfortaeyang #westandwithtaeyang #teamtaeyang.’

Fans instantly flooded her comments section below with love and support for the family.

‘Oh I am so sorry! This breaks my heart,’ a follower replied. ‘No child should have to go through this! Sending strength and love.’

‘Omg I’m so sorry. Sending you so much love,’ an Instagram user said.

‘Oh I am so sorry. I can’t fathom what you must be going through. My thoughts are with you all,’ one penned.

As another added: ‘He is strong. We will get through this. I love you guys so much.’

Deavan and Jihoon split shortly after getting married (Picture: TLC)

According to TMZ, Taeyang was diagnosed with the condition last week, and has been in the hospital ever since.

The publication reports that the mom-of-two – who is currently expecting her third child – was told that it will be a lengthy two-year process for her son.

Deavan and Jihoon first stepped into the spotlight on season two of 90 Day Fiancé: The Other Way, with their relationship playing out in front of the cameras.

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The duo, who have since gone their separate ways, first met on a dating app, with Jihoon making the journey to the US so that they could officially meet in person.

Shortly after their meeting, it was revealed that Deavan was pregnant, with the pair getting engaged and later tying the knot in the same series.

However, it wasn’t to last and they split – with the bride currently pregnant with baby number three, with beau Topher Park.

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