'What to Expect When You're Expecting' director on watching his stars' prosthetics melt off

Being a director can certainly be an interesting and unpredictable job. Just ask “What to Expect When You’re Expecting” director Kirk Jones, who was paid the big bucks to ensure his leading lady, Cameron Diaz, was adequately fulfilling her duties as an expecting mom in the highly-anticipated romantic comedy.

“I was invited to go into a tent and look at Cameron Diaz's breasts. It was a really busy day, and I was tapped on the shoulder I asked to do that. When I say breasts, I mean prosthetic breasts. A lot of the girls had prosthetic breasts and tummies,” he told FOX411’s Pop Tarts column at the film’s premiere this week. “Pretty much every day I had to go and look at them and make sure they were up to scratch, and Cameron's really were up to scratch.”

However, the 117 degree Atlanta heat brought about some unexpected wardrobe malfunctions for Diaz and her co-stars, including Elizabeth Banks and Brooklyn Decker.

“It was very hot and humid, and having a big rubber blob strapped to your stomach wasn't much fun,” Jones continued. “Often we had problems with makeup and they would start to melt. Everyone is human, all these beautiful women are human and when you start to sweat the stomachs to start to come off.”

Inspired by the best-selling book of the same name, “What to Expect When You’re Expecting” is a humorous yet heart-wrenching comedy about five different couples facing the ups and downs of impending parenthood. But surprisingly enough, some of the men on-set knew more about the pregnancy process than the ladies. Namely, Matthew Morrison, whose father is a midwife.

“Once I saw my dad do this thing where the woman wanted an epidural but instead he got her on her hands and knees and let gravity do the work, it was quite amazing. There are so many ways you can have a baby,” he quipped. “But I haven’t seen a C-section yet. Cameron (Diaz) saw her sister have one, and she really wasn’t ready (to see that).”

And working on the film hasn’t turned Chace Crawford off starting a family of his own one day, but for the moment he is content with being an Uncle, as his younger sister Candace recently gave birth to a son with husband Tony Romo.

Yet the “Gossip Girl” star did take away some important words of wisdom.

“Kids really aren't independent. There is a lot of work involved. I can envision being a father but the tough part is finding a wife first, finding a girl,” he lamented.


“Wear condoms,” Crawford advised. “If you don't, things can happen. Babies are born unexpectedly.”

Meanwhile Brooklyn Decker, who is competing against herself this weekend with “Battleship” and this film opening on the same day, shared some concerns for the three-year-old boy who was featured on the cover of last week’s TIME Magazine, still being breastfed.

“I haven't gone through the process of having a child so I can't cast any judgment, but I do feel bad for when the child is a little bit older,” the model/actress and wife of tennis star Andy Roddick added. “I feel like there will be a lot of fun poked his way which is unfortunate, poor kid. When he gets to high school, that could be tough.