"He's awesome," Roberts said of her youngest child who was born in June. "He's gorgeous and he's sweet and he giggles all the time."
Asked if she gave her good friend George Clooney any advice after his recent motorcycle accident, Roberts replied, "I don't want to hen-peck him too much but he needs to be careful.
"He had a girl on his back and he was trying to (be) cool. I understand," she said.
"He definitely looked cool until he ended up on the sidewalk," "Access Hollywood" presenter Billy Bush offered.
"But she was the one with the crutches, poor thing," Roberts said of Clooney's girlfriend, Sarah Larson.
Roberts also said she had concerns about wearing a bikini for a hot tub scene she filmed for her upcoming movie "Charlie Wilson's War."
"I was so pregnant then," Roberts recalled. "I was hoping that they would let me out of that scene because I was four months pregnant! I was holding my breath."
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