The 26-year-old blonde married the Playboy founder - who has four adult children from two previous marriages - on New Year's Eve (31.12.12), 18 months after she called off their wedding just five days before it was due to take place, and thinks having a baby with him would be the perfect way to seal their commitment.
A source told the Daily Star newspaper: ''Crystal's desperate to have Hugh's baby. She thinks it would be the most beautiful way imaginable to show how much she really loves him.''
And Hugh, 86, is said to be equally keen on the idea.
The source added: ''Hef is insisting he's still man enough for the job, telling family and friends at the wedding he's still up for it.
''He wants to show the world that age shouldn't stop you doing anything.''
The pair's marriage came as a surprise to some friends of the media mogul because he was so ''humiliated'' when Crystal called off their nuptials the first time round.
The source said: ''Crystal insisted she simply got cold feet.
''Hef was completely humiliated by her - it was one of the worst moments of his life.''