Katharine McPhee Foster felt it was "romantic" to take her husband David Foster's surname

Asked why she decided to take his surname, she said: "I'm a romantic. I've always liked the idea that it's still a traditional thing that exists in our society. I like the idea. I think it's romantic and it's a great last name ... We've been away since we've been married, so not [yet], but I love it. I just love the ring of it, so I'm enjoying it."

And Katharine adores being with David, admitting their relationship is just incredibly "easy".

She added to Entertainment Tonight: "We just love being with each other. There's no arguing, no drama. It's just easy. That's how it should be."

Meanwhile, the 35-year-old actress and singer is keen to have kids with David and she has his daughters Erin and Sara's blessings.

The trio discussed the prospect during a trip to the Hamptons, with a source adding to Us Weekly magazine: "Sara and Erin fully expect her to have a child and fully support it."

And Sara had previously sung Katharine's praises, insisting she will be a "great addition" to the family.

She said: "She's great. She's a great addition. You know I've learned to not rule anything out [about kids]. I think anything is possible at this point. Who knows? ... She's wonderful. The other day she was like, 'I got you a facial,' and like that's so cool. My dad loves love and my dad loves commitment. My dad's always been married. He's never been single really. He's a real commitment, marriage kind of guy and I'm happy for him."