While nursing Harlow, now 3, in 2008, Nicole Richie said, "I really don't like [having big boobs]." Times sure have changed!
An insider tells the new issue of Us Weekly that the "Fashion Star" mentor got implants this summer.
PHOTOS: Nicole's wild-to-mild transformation
"In the past, she said she wanted a lift, though we never thought she was serious," another source says of Richie.
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Still, "she's been open about it to friends," notes the first insider.
Richie flaunted her fuller physique while vacationing with pals in Mexico on Sept. 24. It's a stark contrast to the flat-chested bikini body she showed off just one year earlier.
PHOTOS: Plastic surgery nightmares
The second source adds that the House of Harlow 1960 designer wanted to improve her bustline for hubby Joel Madden, 32. "The pregnancies took a toll. She said breast-feeding killed what boobs she did have!"
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