Black Eyed Peas superstar Fergie has revealed that while she's "thrilled" to be expecting a baby with her husband, Josh Duhamel, she has no idea what to expect when the little one finally arrives.

During an interview with 'Good Morning America' earlier today (March 21), she explained that it's an exciting time, but also an intimidating one:

"We're thrilled. I know that my husband told everybody what I said. My quote when we found out - 'This s**t just got real."

"But it's true, when that moment occurs to you, there's going to be a human being growing inside of you ... it's reality. It's amazing, we're thrilled."

"I have no idea what I'm doing! I'm just going to play it by ear and see how things go, and let the natural instincts kick in."

When asked how she's feeling so far, Fergie added: "I'm feeling great, I had a little bit [of morning sickness] in the beginning. But very little."

Watch a clip from Fergie's personal interview with Oprah Winfrey here: