Rosie O'Donnell, Fiancee Michelle Rounds Trying for a Baby!

Rosie O'Donnell and fiancee Michelle Rounds have only been engaged a short while, and already they're planning to expand their family!

On Friday's episode of her OWN talk show, O'Donnell, 49, sits down for an hour-long interview with Dr. Mehmet Oz and reveals that she and her fiancee are starting the family planning process.

PHOTOS: Pregnant celebs

"She's trying to get pregnant," O'Donnell tells Oz on "The Rosie Show." (O'Donnell will also appear on Oz's daytime talk show Feb. 2)

"Michelle is seeing a fertility doctor," a source close to O'Donnell tells Us Weekly. "She is really excited and they cannot wait to add to their family. Rosie goes to all of her doctors' appointments with her and is really supportive. She isn't pregnant yet but they hope as soon as possible she will be."

PHOTOS: Celebs who got engaged in 2011

Looking to tie the knot on Long Island where she grew up, O'Donnell -- who was married to Kelli Carpenter from 2004-2007 -- intends to have a low-key ceremony, and involve her four children: Blake, Parker, Chelsea and Vivienne.

"She is thinking of having her brother walk her down the aisle. She wants a proper, traditional wedding this time around," explains the source. "Michelle will say vows to the kids as well as to Rosie."

PHOTOS: Stunning star wedding pics

O'Donnell confirmed her engagement in December 2011 during a commercial break from "The Rosie Show," telling Us later that she knew Rounds was The One "about a week after we met" at a Starbucks coffee shop. "She's literally perfection."

O'Donnell's interview with Dr. Oz airs Thursday on OWN. She'll also be live-tweeting (@Rosie and @TheRosieShow) and answering Facebook questions (www.facebook.com/RosieODonnellOfficial) during the episode from 7 - 8 p.m. (EST)

MORE ON WONDERWALL:

Hilary Duff's Bright and Trendy Maternity Style

Sienna Miller Is Pregnant

2012's Celeb Baby Brigade