United Kingdom, Feb. 10 -- Heidi Montag has revealed the secret to keeping her 20-year marriage to Spencer Pratt alive.

The 36-year-old reality TV star, who met fellow television personality Spencer, 40, in 2006, and now has two children with him, was recently left devastated by the destruction of their home in the L.A. wildfires.

She has now told People about how they maintain the strength of their bond in the face of adversity: "We put each other first."

The couple, who became household names when they starred on 'The Hills', have weathered numerous challenges together, including the loss of their home in the Pacific Palisades fire on 8 January.

They met in 2006 at a nightclub in Los Angeles and quickly became one of the most famous...