Gwen Stefani is convinced her eldest son has a hotline to God after he prayed for another baby brother after mum told him she was done having kids.

The No Doubt star admits she and husband Gavin Rossdale were not planning to add to their brood last year (14) when their third son Apollo Bowie Flynn was conceived, but seven-year-old Kingston had other plans.

She explains, "He asked me, ‘Mum, are you going to have a baby? I want you to have a baby'. I was like, 'It’s over. We’re not having any more. This is our family'.

"(But) Kingston… has a direct link to God, basically. (He said), 'Dear God, please let my mum have a baby. Please, God! Please let my mum have a baby'. I swear to you, he prayed every single night, and four weeks later, I was pregnant.

"I brought out a cake after we found out it was really going to happen and it said, 'We’re having a baby!' I made him read it... and he goes, 'Ah, I prayed for that!'

"Now he prays for everything. He’s like, 'Please, God! Please let me have another cupcake'. He really believes!"