Natasha Hamilton's son has had a bad reaction to a henna tattoo.

The 34-year-old singer - who has sons Josh with Fran Cosgrave, Harry with Gavin Hatcher, and Alfie from her marriage to Riad Erraji, as well as daughter Ella with Ritchie Neville - posted a picture of the painful looking inflamed area on her son's leg, which occurred a week after he had the non-permanent tattoo painted on his body on holiday.

Next to the picture, Natasha - who didn't specify which of her three sons was suffering with the reaction - wrote: ''This is a terrible reaction my son has had after getting a henna tatoo on holiday. It reacted after a week when he went swimming back home (sic)''

And it's not just the Atomic Kitten singer's children who have been in pain lately, as Natasha herself was forced to pull out of her pantomime performance in 'Aladdin' in December at the Epstein Theatre in Liverpool at the last minute when she made a dramatic dash to accident and emergency for ''severe stomach pains.''

A source said at the time: ''Natasha [who plays Princess Jasmine] was feeling really unwell and made the decision to visit A&E. It was stomach pains which have flared up from last year. She will probably need an operation this month.''

Meanwhile, Natasha also recently opened up about an incident involving her eldest son Josh, now 14, which saw him ''held down and shouted at'' on a school bus.

Natasha shared previously: ''Only two days ago my son was set-on on a school bus and held down and was being shouted at. My eldest son, Josh, he's 13. And they were saying, 'Oh your mum's a 4x4', and things like that. And that just breaks my heart because he was so upset.

''Cruel comments are tough for me to read, but as an adult, and being in the industry for many years, I just have to put on my armour and get on with it. But now it's trickling down, and the children are on social media, they read magazines, they read comments.''