"Kate is very proud of her slim body and never lets her stomach hang out in public, but she seemed very proud of her bulge as she left a business meeting," the Daily Star quoted a photographer as saying.
"She appeared to be very aware that people were staring at her belly and didn't care. She was smirking to herself as she revealed what looks like a baby bump," added the photographer.
Price already has three children and has been very vocal about her plans to start a family as soon as possible with new husband Alex Reid.
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