Jessica Simpson and boyfriend Tony Romo have been spotted engagement ring window-shopping in Dallas.

The couple were checking out diamond encrusted wedding rings, sparking rumours that Jessica is planning to marry for a second time.

Jess and Tony - who have been together almost a year – are looking to have a winter wedding, the Chicago Sun-Times reports.

The pair are said to be planning a trip down the aisle after the National Football League season has finished and the Super Bowl is over.

Jess recently confessed that Tony has to put up with her constant tooting between the sheets – the stuff of true love, right?