DailyMail.com has reached out to reps for Miranda for comment.
Miranda is already mom to seven-year-old son Flynn whom she shares with her ex-husband, the actor Orlando Bloom.
She and Bloom divorced in 2013 after three years of marriage.
Evan and the former Victoria's Secret star publicly confirmed their romance in June 2015 and married in a "small but lavish" ceremony at Evan's home in Brentwood, California, in May last year.
Miranda wore a stunning Dior Haute Couture wedding dress and also personally cooked Evan's favourite dish - slow-roasted chicken scented with turmeric and lemon - for their wedding breakfast.
The caterer replicated the dish for the 40 or so guests, Vogue reported.
Evan wore a Dior morning suit and Miranda's son Flynn, who served as ring bearer, wore a three-piece navy suit by Dior. The youngster also joined his mom and step-dad for the first dance, according to Vogue.
The couple announced in November that they were expecting their first child together.
Miranda has previously spoken about how she waited six months before she introduced Evan to her son Flynn, something she and ex Orlando had agreed together as they embarked on new romances.
'Evan met Flynn, so yeah, things are going well. Orlando thinks he's great. We're just a modern family now!' she said.
