READ: Faith Hill and Tim McGraw's daughter Gracie shares sadness over 'corrupt Broadway'Taking to social media, Audrey posted the snap which showed Justin and his N'Sync band member JC Chasez sitting on a bench with her older sisters Gracie and Maggie standing behind them.WATCH: See the love story of Faith Hill and Tim McGrawBut Audrey, who appeared to be only a few months old, was sitting on Justin's knee with a shocked look on her face.Posting the picture twice, in the first Story she tagged Justin and in the second simply added the word 'stunned'.MORE: Tim McGraw and Faith Hill's daughter Gracie shines in candid bathroom selfiesMORE: Faith Hill and Tim McGraw's daughter Gracie sets the record straight about her social media presenceAll three of Tim and Faith's girls are talented singers, with Gracie a budding Broadway star. Audrey has also shared footage of herself singing on social media in the past, receiving compliments from the likes of Rita Wilson.Maggie doesn't have an active social media presence but was in a band at Stanford University, where she graduated a few years ago.