A reporter from Sydney's Daily Telegraph newspaper spoke to 34-year-old Antonia at a Disney channel party on Sunday, suggesting Nicole's "big news" must be very exciting for the Kidman family.
After initially replying, "Yes, yeah...," Antonia quickly retraced her enthusiasm, saying, "I mean, ah, I guess, ah, no, I don't know."
Nicole, 38, and New Zealand-born Urban, 38, reportedly got engaged over the Thanksgiving weekend in Nashville, Tennessee, where they celebrated the holiday with both their parents.
Antonia says, "My parents just got back last night, they had a great time but I haven't had a chance to see them and get all the news yet."
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