08/09/2013 at 07:00 AM EDT
may look like she's auditioning for a role in the next Pirates of the Caribbean
film, but the real reason she's wearing an eye patch hits
a little closer to home.
"So this is what happens when you play tennis with your kids …" the mom of two captioned the pic she posted on Instagram
Aug. 6. "Someone had a good forehand! #mommyinjury"
The 51-year-old didn't reveal which of her two sons
– Wyatt, 6, or Levi, 3 – was to blame, but judging by her smile in the photo, she wasn't holding a grudge.
The "Strong Enough" singer's first country album, Feels Like Home
, is due out Sept. 10, and hopefully she'll have ditched the patch by then.