Credit: Bob D'Amico/ABC © 2014 American Broadcasting Companies, Inc. Photo: Meredith Grey (Ellen Pompeo)

See any family resemblance in the photo below? Grey's Anatomy star Ellen Pompeo (Meredith Grey) posted a photo on Instagram of herself posing alongside her on-screen half-sister, actress Kelly McCreary (Maggie Pierce).



Credit: Ellen Pompeo on Instagram Photo: Ellen Pompeo and Kelly McCreary on the Set of Grey's Anatomy on August 13, 2014

"Sister from another mister?" Ellen writes in the caption to the August 13 post.

Kelly retweeted Ellen's link, adding, "First family photo."

Ellen's character, Meredith Grey, was seemingly unaware of the DNA she shares with the new Grey Sloan Memorial surgeon when Season 10 left off — she only knew Maggie as Cristina's pick for the hospital's new head of cardio.

But we fully expect Mer to be clued in when Season 11 premieres in September — especially now that Richard (James Pickens Jr.) knows that he and Mer's mom, Ellis (Kate Burton), had a love child who happens to be his new colleague.

The half-sister reveal might be new information to us, but Grey's creator Shonda Rhimes tells TV Guide that she and the other writers have waited years to pull the Maggie trigger.

"It's not a thing where we're going in and backdating," she explains. "It's literally always been layered into the storyline. We can literally go back and pull out moments of the show, and I'm excited to do so and point out where it was talked about. It's not going to be so hard to do."

Looking forward to it, Shonda!

Grey's Anatomy Season 11 premieres Thursday, September 25, at 8 p.m. ET on ABC.

Source: TV Guide

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Dan Clarendon is an assistant editor at Wetpaint Entertainment. Follow him on Twitter and Google+!