Giuliana Rancic thinks her son is the ''smartest'' baby ever.

The E! News anchor - who welcomed her first child, Duke, with her husband Bill Rancic via gestational carrier in August 2012 - says her eight-month-old son has a huge personality and is developing very quickly.

The 38-year-old presenter, who moved to Los Angeles from Naples, Italy, when she was a child, told ''He's been going, 'Mama mama, Dada dada,' but I don't know if he knows what he's saying.

''Bill asked me the other day how we know if we're parenting right and I told him, 'You know you're doing something right when you have a happy baby who laughs and smiles. I swear he is just the cutest, smartest, most alert baby ever.

''Right now his personality is kind of split between Bill and I. When he wants something really bad, the fiery little Italian comes out -- his arms go down to his side, he turns red and goes, 'Grrr.'''

Giuliana, who has been very open about her fertility struggles after being diagnosed and treated for breast cancer in 2011, admitted she is very excited about her first Mother's Day (12.05.13) and even got an early present from her husband.

She said: ''The one thing I'm doing is first thing in the morning, putting an auto response email out that says, 'It's Mother's Day and I'm unplugging for the day to be with my family.'

''Bill got Duke's birthstone -- which he pointed out is also mine since we were both born in August -- as a necklace. It was very sweet.''