Katie Price has apologised to Kelly Brook for calling her a ''heffer''.

The reality TV star - who is pregnant with her fourth child with her new husband Kieran Hayler after a whirlwind romance - reached out to the brunette model, 33, on Twitter today (02.03.13) and praised her as a ''natural beautiful girl.''

In a heartfelt message, she wrote: ''@IAMKELLYBROOK I'm really sorry for what I've done you know I think your a natural beautiful girl we go back a long way so I'm sorry xx''

The 36-year-old glamour model's apology follows comments she made about being shocked to discover how ''big'' Kelly really is when she saw pictures of her in a bikini last month.

She wrote: ''Kelly Brook is a brilliant role model for girls because of her curvy figure. Every mum should make her daughter look at pictures that show Kelly modelling her latest New Look swimwear range in Miami.

''They don't seem to be air-brushed and I'm FLABbergasted to see how big Kelly really is ... You're a heffer, Kelly, but still a hot one.''

Kelly then hit back at Katie's jibes about her weight and the 'Piranha 3D' actress insisted she is proud of her womanly body.

Asked whether she sees herself as a role model for girls, the busty beauty said: ''I didn't until recently! Then when I was attacked by another female celebrity, so many women jumped to my defence - I was overwhelmed.

''Women would contact me and say they loved my body and that I was beautiful. I was so touched. It's hard being 33 years old and still modelling but I do it because it's nice to have a real representation of a woman out there.

''So now I'm very proud to be curvy, prouder than ever because of these beautiful strong women that had my back. I love that women like my body!''