Bruno Mars’ 13-year relationship with his stunning girlfriend Jessica Caban is reportedly ‘on the rocks’.

The American singer, 38, and the model, 41, have been in a relationship since 2011 but are said to have spent Christmas and New Year’s Eve apart.

Friends of the couple claim they are now ‘living separate lives’.

They told The Sun: ‘Bruno and Jessica barely spend time together anymore — it is really sad.

‘They are living separate lives so it doesn’t bode well for their relationship. It feels like things are fizzling out between them.

‘They have so much history together but we aren’t sure whether they will be able to save things this time.’

Bruno and Jessica met in 2011 when the Just The Way You Are hitmaker spotted her at a restaurant in NYC and decided to introduce himself.