Everything to know about Hugh Hefner's 31-year-old widow, Crystal Hefner

Hugh Hefner, who passed away Wednesday evening at 91, is survived by his wife Crystal Hefner.

Hugh Hefner has been romantically linked to many women, but he's only had three wives. Crystal is Hugh's third and final wife.

The pair married back in 2012, when Crystal was 26, and Hugh was 86.

Hugh and Crystal were married for five years, and appeared to have had a happy marriage together during that time. However their road to the altar wasn't so smooth.

The pair became engaged in 2010 and were expected to wed in 2011, but Crystal famously pulled out of the wedding five days before.

But despite the rocky start, Crystal and Hugh seemed happy together, and the model could often be spotted in Hugh's Instagram feed. Hugh's son Cooper also mentioned Crystal in his tribute to his father, posted on Twitter Thursday.

You might not be familiar with the woman behind the media mogul, but besides being a model, she's also a singer, travel blogger, and an advocate for Lyme disease awareness.

Here's everything you need to know about Hugh Hefner's widow: