Jamie-Lynn Sigler has given birth to a baby boy.

The Sopranos star, 36, and husband Cutter Dykstra welcomed son Jack Adam Dykstra this week and she shared sweet snaps with fans on Instagram. They already have a son Beau, three.

She wrote: 'He’s here. Jack Adam Dykstra we will talk about your tardiness eventually, but for now we’ve got a lot of love to give. Thanks to my besties for helping me laugh and smile and to my husband for just being my rock.'

Baby joy: Jamie Lynn Sigler welcomed a son Jack Adam Dykstra this week

Baby brother! The actress shared this sweet snap of son Beau, three, holding baby Jack

Jamie-Lynn announced she was pregnant on social media in July, noting that she was 'so excited'.

The actress had previously admitted she was worried her multiple sclerosis (MS) would stop her from having children.

Speaking in 2016, she said: 'I was so relieved when I was pregnant [with Beau] because I was so afraid I was going to have trouble because of all the years of [treatment]. You never know how things are going to affect you.'

'Thanks to my besties for helping me laugh and smile and to my husband for just being my rock': Jamie wrote on Instagram on Tuesday alongside a collection of snaps

Hey baby! Jamie-Lynn's pals - including JoAnna Garcia Swisher (right) - threw her a baby shower earlier this month

And Jamie-Lynn has always been keen to have another child but already felt like 'the luckiest girl in the world' because of the two amazing boys in her life.

She added at the time: 'I would love to have another child. I would love to be working and feel inspired and strong, but if life takes another path, I'll be okay.

'I've got my brain and my heart, and I've prepared myself for everything that could happen. But I've got an amazing husband, the best son, and I hope that we can make more babies and just keep having fun. I'm the luckiest girl in the world.'

Bumping along nicely: The star has been documenting her pregnancy on Instagram

Jamie-Lynn who is best known for her role as mobster Tony Sorano's daughter Meadow in the HBO drama Sopranos.

She was first diagnosed with MS at the age of 20 and described the news as 'a sobering moment,' and has admitted that she 'lived in denial for a while.'

She kept her illness a secret for 15 years fearing it could end her career.