The actress, who is expecting her second child, explained that she "can't believe" how quickly her pregnancy has gone.
She told TV talkshow host David Letterman: "We're getting close - weeks. Getting close enough to almost not be able to fly. I don't feel prepared. I can't believe how fast it's gone."
The 32-year-old is expecting her baby with fiancé Matt Bellamy and admitted that their relationship developed very quickly.
She said: "I was so excited to be single.
"And of course that's when you meet this amazing love. There he is - 'I love you'. Next thing you know, you're knocked up!"
Hudson insisted that she feels fortunate to have the Muse frontman as her partner.
She added: "He's a lovely, lovely man, English boy, a musician, and he's wonderful. I feel very lucky."
Watch Kate Hudson on the Late Show with David Letterman below: