updated 07/05/2010 AT 4:00 PM ET
•originally published 07/05/2010 AT 4:15 PM ET
When it comes down to the numbers, Serena Williams has outdone older sister Venus.
But even with 27 grand slam titles, a No. 1 world ranking and a spot on women tennis’ all-time greatest champions list, Serena says there’s one thing Venus has that she always wanted – but never could get.
“I’m super-curvy. I have big boobs and this massive butt. [Venus is] tall and she’s like a model and she fits everything,” the younger Williams sister tells Harper’s Bazaar.
“I was growing up, wanting to be her, wanting to look like her, and I was always fitting in her clothes, but then one day I couldn’t,” she recalls. “I was 23 when I realized that I wasn’t Venus. She’s totally different.”