United Kingdom, June 12 -- Erin McNaught and Stace Cadet have been left heart-broken after their seven-month-old son was diagnosed with a brain tumour.

The 43-year-old model - who was previously married to musician Example - and the Australian record producer had noticed a "rapid decline" in their little one Obi's behaviour and happiness in recent weeks.

The couple took him to hospital, where a neurosurgeon delivered the heart-breaking news that he has a "large brain tumour" on the right side of his brain, leaving the pair "absolutely shattered".

In a joint post on Instagram, they wrote: "For the last few weeks we have noticed a rapid decline in Obi's behaviour and happiness. He was having problems eating, sleeping and most recently, k...