More photos of Nicole Richie's post-baby body have surfaced.
The 27-year-old star — who gave birth to son Sparrow Sept. 9 in Los Angeles — took her 11-year-old sister, Sofia, to a Selena Gomez concert in West Hollywood Friday.
"Took my little sister to see selenagomez 1st show," Richie Twittered. "Or she took me..."
Richie first showed off her baby body Sept. 16 during a Los Angeles outing with 18-month-old daughter Harlow.
She has yet to reveal how she lost the weight.
But since giving birth, she seems to have changed her diet. While pregnant, she craved In-N-Out Burgers. After welcoming Sparrow, she Twittered that she wanted "sushi."
Richie also lost the baby weight fast after welcoming daughter Harlow in 2008.
At the time, Richie said she was breastfeeding and, as a result, had to watch what she ate. She said she mostly stuck to "bland" foods, like soup and fish.