Dannii Minogue has "mellowed" since becoming a mother.

The singer-and-TV talent show judge gave birth to Ethan - her first child with partner Chris Smith - July and her sister Kylie Minogue is astonished by how much her sibling has changed with parenthood.

Kylie said: "Having a baby has changed her. She's mellowed and gone into a zone that's very deep and I've never seen her like that before.

"She's still hard-nosed and determined, but there's something that's changed in her that's really beautiful to see."

Kylie - who is in a relationship with Spanish model Andres Velencoso - is unsure if she is able to have children naturally after undergoing treatment for breast cancer in 2005 and admits she feels "wistful" when she spends time with Ethan, though she loves being an aunt.

She added to Britain's Glamour magazine: "It's lovely to see Ethan. I look at him wistfully. He's a beautiful baby. I've got my auntie stripes on and I'm ready to go."