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.
PHOTOS: Can you guess the bra sizes of your fave celebs?
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!"
MORE FROM WONDERWALL:
Nicole Richie Turns 30
Jessica and Honor Head to School, Plus More Celebritots
30 Stylish Ladies
Check out some of Kim Kardashian's tightest outfits.
Demi Lovato drops some major newborn scoop about Selena Gomez's family on today's Celebs Gone Social.
Ashley Greene reveals a painful wound from a wild Bali vacation on today's Celebs Gone Social.
From Jennifer Lawrence to Rihanna, see the best off-season celeb bikini bods.
Two months after major marital problems, Ozzy and Sharon do a Hollywood date night on Celebs gone Social.
From David Beckham to Ben Affleck, check out Hollywood's hottest dads.
© 2013 Microsoft