Insiders claim to Star the pair's relationship has been rocky since April, just after Danny, 32, and Kate, 39, announced on Instagram that they were expecting a baby girl.
'Danny proposed soon after they found out Kate was pregnant, but they butted heads from the start; they couldn't even agree on a wedding date, which was a bad sign,' says a source.
According to Star's shocking report, Danny and Kate's romantic getaway to New York was anything but.
'Danny couldn't take it anymore and stormed out.'
Adding to the couple's turmoil is rumours of Kate's alleged fling with Brad Pitt, which left Danny feeling 'insecure.'
'Who wants to know their girlfriend dated Brad Pitt?' a friend told Star.
Neither Kate, Danny or Brad have responded to Star's bombshell report.