These girls sure aren't backing down! A few days ago, Miley Cyrus posted a cleavage-baring pic and mocked Selena on her Instagram page. Well this time, Selena is firing back!

Brandon Smith, a co-star of Selena in the movie The Revised Fundamentals of Caregiving posted a photo of himself with Selena on January 24. While it looks like it's no big deal, some will argue that it's clear that they were getting back at Miley for her previous Instagram taunt, which was obviously towards Selena.

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In the photo, both Selena and Brandon have their tongues out and we all know that it's Miley's trademark look when she's performing or taking pictures.

Brandon posted the photo along with the caption, "when it's family it's for life #family4life #blessed I love you sistddddduuuer #iloveu more than you'll ever know ... #iwantyoutoknow"

It looks like Brandon, who is not only a co-star, but also a really good friend of Selena totally has his sister's back!

In case you don't know what happened, Miley posted a sexy selfie a week ago which was identical to the bikini selfie of Selena and accused "The Heart Wants What It Wants" singer for posting the cleavage-baring photo to gain more Instagram followers.

Miley captioned the photo, "Do yiew tink if I push muah titties up I'll get mo followahhhzzzz? #shouldigrowmyhairout?"

TagsMiley Cyrus, Selena Gomez