They’re said to have fallen out at Davinia Taylor’s 30th

Kate Moss and Sienna Miller reportedly had a bust-up at mutual pal Davinia Taylor’s 30th birthday bash on Saturday night.

The pair are said to have rowed over actor Rhys Ifans, 39.

Kate is afraid Sienna, 25, will break his heart.

‘If you hurt Rhys, you’ll have made an enemy for life,’ the supermodel, 33, was overheard saying.

‘Treat him right and we’ll leave you alone. But don’t hurt him because we love him – and we always stick together.’

Sienna didn’t seem to take the warning well.

‘Sienna was gobsmacked by what Kate had said,’ a source tells the Daily Mirror. ‘She turned on her heel and took to the dance floor. She just couldn’t believe it.’

Kate is good pals with Rhys, considered one of the Primrose Hill set, along with Sadie Frost, 42, Pearl Lowe and Davinia.

Sienna’s spokesperson denied that there’s any problems between the girls. Kate’s rep declined to comment.

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