Katharine McPhee: Life With The 'Bunny' Baby Bump

Just eight months ago, Access Hollywood caught up with a fit and trim Katharine McPhee during a photo shoot.

Oh how times have changed, as we now find that Kat’s flat tummy has turned into a full-fledged baby bump.

Of course, it’s all in the name of art – specifically, her new movie “House Bunny” with Anna Faris and Rumer Willis.

Access’ Billy Bush paid a visit to the set to talk to Katharine about life as a knocked up sorority girl.

“This image is great – unmarried and pregnant,” Katharine laughed.

Made-up-mama-to-be McPhee was rockin’ the faux pregnancy glow as she showed off her prosthetic preggers prop on the set of her new indie comedy.

“How does it attach?” Billy asked of the fake belly.

“Well, it’s kind of like a bra. It’s attached as all one piece. It’s like, imagine a leotard on a ballerina,” she explained. “If I lifted my dress… you’d probably be offended so I won’t do that.”

“We’ve seen it before,” Billy joked.

“Of course you have. How could I forget those pictures,” Katharine sighed.

Katharine has provided some top notch paparazzi material on the set. Not only was she snapped taking a squeegee to her baby bump in between takes, but thanks to one ill-timed gust of wind, Kat also showed off a different “side,” as her dress went flying.

“No one actually wanted to tell me that it was out there until went online myself and was like oh,” she said of the photo showing off her backside.

“Is it worth it?” Billy asked. “A life that’s full of fantastic projects like that and successful albums and all of that to occasionally have a shot of your rear out there for the world to see?”

“Well fortunately for me, the lighting was good in that picture,” she smiled.

But Katharine isn’t the only character sporting an outrageous costume for “House Bunny.”

The film’s star and creator Anna Faris plays an exiled Playboy bunny-turned-sorority house leader.

And she gets to flaunt her killer body in a barely-there costume creation.

“I’m their house mom and some of the girls are pretty resistant to the idea of a former bunny being their house mom,” Anna explained.

“It’s the book worm sorority,” Billy added.

“Yeah it is,” she said.

Then, there’s the back brace bearing Rumer Willis, who proudly parades a bulky apparatus for her role as a socially inept sorority gal.

”I think it’s kind of sexy,” Rumer joked.

As it turns out, Access just happened to be there for a special occasion – Rumer’s 19th birthday, as Billy gathered the “Bunny” troops for a calorie-packed b’day surprise.

“I think it’s the biggest cake I’ve ever seen,” McPhee exclaimed.

“How would your pilates instructor feel about you eating half of this?” Billy asked Anna.

“Awesome,” she smiled.

“Thank you guys, this is amazing,” birthday girl Rumer said. “It’s probably the biggest cake I’ve ever had.”

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