Katherine Heigl has ''already tried'' asking her husband Josh Kelley for more children.

The 38-year-old actress gave birth to her third child, Joshua Bishop Jr., just eight weeks ago but has said she's already thinking about expanding her brood even further, although her 37-year-old husband might not be so keen.

Asked if she was planning on having any more children, Katherine said: ''I've already tried to have this conversation [with Josh], but it's so funny - at eight weeks, he's like, 'I'm not talking about this right now!'

''I think once you have two, it doesn't matter anymore!''

The 'Doubt' star - who also shares eight-year-old Nancy and four-year-old Adalaide with the 'It's Your Move' musician - admitted her third pregnancy ''wasn't planned''.

She confessed: ''It wasn't planned. I did want to expand our family - we just weren't sure how we were going to do that and I'm all about preparation and planning and timing. Sometimes you just can't do it that way or you get 'surprised' with something and you have to make it work.

''It ended up working so much more beautifully than I ever could have imagined and the fact that we wrapped up filming in December and now I have all this time with him to just be mom ... it's such a blessing. I'm so grateful.''

Meanwhile, the 'Knocked Up' star - who married Josh in 2007 - gushed about how ''proud'' she is of her children, saying she is happy to put them in front of a camera to show them off to the world.

She told 'Entertainment Tonight': ''I just keep tossing that kid out in front of the cameras ... all of my children! I'm just so proud of them and I think they're so amazing and find them far more interesting than me in so many ways. So it's easier for me to push them out there in front of the camera... sorry kids!''