Kristen Stewart and Robert Pattinson had been planning to have a baby together before she was caught cheating on him.

The 22-year-old actress and the 26-year-old actor - who have been together for four years - had reportedly been talking about starting a family before she wrecked their plans by having a fling with her married Snow White and the Huntsman director Rupert Sanders.

"They had been talking about having a baby together once Twilight ended, which is what makes this so extra-painful. Kristen knew how badly Rob wanted to start a family, and it was a subject that had dominated their conversations in recent months. Rob would be a great father, and having a baby would probably have brought them even closer together," a source close to them said.

Although Kristen and Rob have not released a statement on the future of their relationship, Kristen fears there is no way back for them and their baby dreams are over. "Kristen fears she'll never have the chance to get Rob back, and that their baby dreams are now totally shattered. Kristen feels so terrible, this is truly a nightmare for her, but there's nothing she can do to turn back time. If Rob takes her back at this point it will be a miracle, but she knows she only has herself to blame," the source continued.