The 28-year-old model - who will celebrate her one-year anniversary with the 'All Of Me' hitmaker in September - has admitted the couple are ready to start a family.
She told Mario Lopez as she co-hosted 'Extra' at the Universal Studios in Los Angeles yesterday (16.07.14): ''We both really want kids... we are not, not trying, I will tell you that.
''As we say it's a fun process... it's definitely going to be a surprise, and a surprise we'd be happy for.''
The stunning brunette - who appears as a judge on MTV's new cooking show 'Snack-Off' - also admitted that while she enjoys making healthy home-cooked meals for herself and John, 36, she still finds time to enjoy her favourite fast-food treats.
She explained: ''I've dubbed myself the soup master. I love making soup. Something about soup makes me so happy... I'm on this tomato basil soup kick, then this chicken soup is really pretty good.
''I cook three or four times a week, I made John homemade chicken soup late last night 'cause his voice is a little sore.''
She added: ''I love a good Hot Pocket and I love White Castle and I love Taco Bell.''
However, the 'Sports Illustrated' cover girl is currently trying hard to control her cravings and get her ''butt'' in shape for an upcoming shoot.
She said: ''I'm working out like crazy lately, I have a big shoot coming up, so for two weeks a year Chrissy settles down and she's in it right now.
''I'm trying to develop a butt.''
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Pratchett died aged 66 in March 2015.