The 41-year-old pop star - who is currently dating Spanish model Andres Velencoso Segura - admits seeing her sibling`s baby bump grow has made her think about having a child herself.
Kylie said in an interview with 2Day FM`s Kyle and Jackie O radio show: "I`m not jealous but it does make me think, `Aw, yeah!` I can`t contain myself.
"When I saw her before she left London I felt the baby kick which was amazing, it was one of those cartoon moments where it was like a big Kung Fu kick. I was like, `I know this is happening, I`m a rational person but as you`re my sister it`s still surreal to me, you just have a balloon up your top.` We`re all very excited."
The `I Believe In You` singer launched the first single `All the Lovers` from her album `Aphrodite` on 14.05.10 and admits working on promotion for the LP will mean it is unlikely she will step into Dannii`s shoes for the audition stage of British TV talent show `The X Factor` while she is on maternity leave.
She said: "That rumour was going around but I don`t think that`s going to happen. A - I don`t think I`d be very good at it. And B - I`m too busy doing other things."
Just as Dannii is happy with her man, former rugby star Kris Smith, Kylie recently confessed she is "very happy" with Andres because he is so "easygoing".
She said: "I`m in a very happy, romantic place and Andres is so level-headed and easygoing. It`s enjoyable. He`s a good socialiser - which is good for me, because I could so easily do my work, which involves so many people, then go home and stay home. I-m so boring."