Jennifer captioned the intimate picture: ‘#tbt First pic my husband took of me pregnant. I was 14 weeks and had no idea how much my body would change. Life would change and my heart would grow.’
The Party of Five alum continued: ‘The best thing I have ever done will always be marrying him, having our kids and watching them change and grow everyday.’
And she added a string of hashtags that said it all: ‘#grateful #happymommy #happywifey #luckygirl #mylittlefamily.’
Jennifer and Brian also share son Atticus, two.
She walked her first red carpet in four years earlier this month while promoting her new Fox crime drama 9-1-1.
Jennifer left CBS hit Criminal Minds after one season in 2015 to focus on her family.
After seeing photos from the event, she apologized for ‘how wrecked’ she looked, in an Instagram Story posted on May 15.
‘Nobody tells me the day is going to be like 12 hours long and humidity is going to be almost 100 percent in New York so I just have to apologize,’ she began.
‘Wearing a black suit, not a good idea, that’s A. B, not wearing enough hairspray and teasing in my hair, also a bad idea.
‘I just have to apologize for how wrecked I looked in all the pictures that have come out,’ she continued. ‘By the time I got to the red carpet, I was honestly melting.’
Jennifer also flew into New York City from Los Angeles with Autumn and Atticus.
‘[It was my] first time traveling with toddlers,’ she added. ‘Honestly, I apologize. I should have really gotten it together.’
Season two of 9-1-1– will air on Mondays in the fall.