Four isn't enough for Rosie O'Donnell.  She and her fiancée Michelle Rounds are hoping to add to her brood with another baby.

"She's trying to get pregnant," Rosie told guest Dr. Mehmet Oz on an episode of her talk show Friday.

O'Donnell and Rounds have had a whirlwind romance.  They met at a Starbucks, and became engaged only a few months later, in early December.

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"Michelle is seeing a fertility doctor," a source told Us magazine. "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."

The pair is hoping to wed later this year, with Rosie's four kids in the wedding party, and her brother walking her down the aisle.

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Her talk show episode with Dr. Oz airs Thursday on OWN.

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Oprah Winfrey: ‘Running A Network Is Challenging’

Imagine throwing a party – and the guest of honor doesn’t show up!

Well, that’s kind of what happened at the 38th annual Daytime Emmy Awards Sunday night in Las Vegas when Oprah Winfrey did not accept in person the prestigious Crystal Pillar Award for changing the face of daytime television.

Instead, the former Queen of Talk accepted in a pre-taped acceptance speech from her Chicago-based Harpo Studios, surrounded by her staffers.