Model Cindy Crawford and her husband, businessman Rande Gerber, have paid a heartbreaking tribute to their son,  Presley Gerber, a month after his demise at the age of 27. Their daughter, model Kaia Gerber, also paid tribute to her brother in an emotional post.

Presley died on September 20 at a rehabilitation facility in Los Angeles. The cause of his demise has not been known.