Tearing up on her final show before she goes on maternity leave, Bickmore said, "They're so cute together."
"They're a little team. He (Ollie) never thought he was going to get a baby brother or sister and then he got a little sister and they're seven years apart and they're joined at the hip."
"And I know families of three and I know they'll all love each other so much, but I don't want anything to happen to their bond. So it makes me a little sad."
Carrie shares Evie with her partner Chris Walker, while Ollie is her firstborn, who she had with her first husband Greg Lange - who lost his battle with cancer in 2010.
The family can't wait to welcome their newest addition in the coming weeks.