Spencer Pratt, Heidi Montag reunite?

Former Hills stars Spencer Pratt and Heidi Montag have sparked rumours of a reconciliation after they were spotted out in public together.

TMZ has posted pictures of the estranged couple, who filed for divorce last month, looking happy while participating in the Avon Walk For Breast Cancer in Los Angeles yesterday.

The photographs have cast more doubt over the veracity of the couple's ongoing separation, with the website commenting: "The rat we're smelling is beginning to stink."

Pratt has only recently returned to the US following his detainment in Costa Rica on an illegal firearms charge.