Reese Witherspoon's fans had to do a double-take after the Big Little Lies star shared a photo of her daughter Ava on Instagram.The Legally Blonde actress, 44, posted a sweet picture of her firstborn over the summer sitting outside in their beautiful garden with her little brother Tennessee, eight, and at first glance, Ava, 21, could have been mistaken for her famous mum.Fans were quick to comment on just how much Ava looked like Reese, with one writing: "So beautiful and your twin," while another wrote: "Straight up thought that was you and your son at first." MORE: Reese Witherspoon and teenage son could be twins in latest photo WATCH: Everything you need to know about Reese WitherspoonA third fan added: "I didn't read the caption and.
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