Nicole RichieNicole RichieNicole Richie is doing a sterling job at the mummy business.

And who better to say so than her own celeb papa?

Lionel Richie went on Ryan Seacrest's radio show and got baby-related verbal diarrhoea.

He just couldn't contain himself as he chatted about his news granddaughter, Harlow.

Lionel (who referred to himself as G-Pa) said: "That baby is the sweetest, most beautiful baby. Nicole's kid is amazing."

Nicole, he said, "has turned into a full-fledged mom".

"It's the most frightening thing in the world because you keep thinking, 'Are you going out?' And (she's like), 'No, dad, can't go out. She has another feeding - I have to be right here.'"

Nicole with dad Linonel RichieNicole and Lionel RichieLionel said the "funniest picture" was Nicole after she gave birth.

"She had this look of her face, and I said, 'And it doesn't come with a manual.'"

But what does he make of Nic's man, Joel Madden?

Lionel said he has his "fingers crossed" they'll get hitched. "This guy is so in tune with Nicole - I love him to death."

"I couldn't ask for a better guy, if there is a matrimony down the line, you'll know it first cos I'll be telling everybody."