February 26, 2013 09:00 AM

Brendan McDermid/Reuters/Landov

Kim Clijsters is trading in her tennis racquet for diaper duty!

The former professional tennis player and her husband Brian Lynch are expecting their second child together in September, Clijsters announced on Twitter Monday.

The couple are already parents to daughter Jada Ellie, 5.

“Hi everyone, we have some exciting news to tell you … Jada is going to be a big sister!” the mom-to-be Tweeted.

After competing in her final U.S. Open in August, Clijsters, 29, officially retired from the sport, and, according to the athlete, placed expanding her family high on her priority list.

“And here we are: halfway into September Jada will have a brother or sister. We are of course delighted,” Clijsters writes on her site. “I’m doing fine, even though I tire more easily right now.”

Clijsters and Lynch married in 2007.

— Anya Leon

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