Jessica Alba walks out on fiancé Cash Warren?

After a series of explosive rows over her pregnancy, Jessica Alba walked out on her fiancé Cash Warren, vowing she'll never have another baby, NW reports

Sources say the couple, whose first child is due in May, have been arguing nonstop over nearly every detail of parenthood.

Eventually, sick of the constant conflict, the mum-to-be decided to go to the Sundance Film Festival in Utah without her man.

"Jessica was so distraught that she fled LA — and Cash — and took off for Sundance alone," says a friend. "She's telling everyone that she just needs time away. It's an act. Jessica's secretly a wreck."

After a few days of being apart, Cash eventually decided to follow Jess to Sundance. But it may have been too little, too late. "She feels like she's in her pregnancy alone," says the source.

Adds another friend, "They can't agree on anything anymore. Jessica picks a baby name and Cash says 'no way'. Then any name Cash thinks is cool, Jessica thinks is stupid."

The source says before they knew they were going to be parents, Cash and Jess had been struggling to get their relationship back on track. The couple's romance had been rocked by a Russian model's claims Cash was cheating on Jess with her.

"The baby was a bandaid measure," says the source. "They thought that having a baby together would help."