'You are TWINS!' Jennifer Garner posts Father's Day tribute to her dad William... as fans freak out over their likeness

Jennifer Garner had some of her fans seeing double on Father's Day. 

The Alias star posted a touching tribute to her father William John Garner - who she referred to as Billy Jack - on Sunday via Instagram, but her followers immediately flooded the star with comments over their likeness. 

'Oh my goodness you are TWINS! Wow!' one person wrote, while another said: 'Wow! Carbon copy.'

Seeing double: Jennifer Garner posted this touching tribute to her father Billy Jack on Sunday, with fans commenting that the pair look alike

Seeing double: Jennifer Garner posted this touching tribute to her father Billy Jack on Sunday, with fans commenting that the pair look alike 

Jennifer - who is divorced from ex-husband Ben Affleck - said in her caption: 'Look at this face - equal parts mischief and crazy intelligence. Thank you, Billy Jack, for working your tail off, for hugging the world's best hugs, and for mowing the lawn in the dark.'

'I grew up with the luxury of taking your work ethic, your integrity, your steadfast love of my mom, my sisters and me for granted,' she added.

The actress also revealed that she spoke with her father yesterday, explaining that he told her 'We love you so much and we are so proud of you.'

Freaking out: Fans think Jennifer Garner looks just like her father William

Freaking out: Fans think Jennifer Garner looks just like her father William

Family: Jennifer Garner with her father William John Garner, and mother Patricia Ann, in 2004

Family: Jennifer Garner with her father William John Garner, and mother Patricia Ann, in 2004

She added: 'What more could a child ask of a father.' 

Jennifer has three child Violent, 14, Seraphina, 11, and Samuel, 8, from her marriage to Ben, who is now dating actress Ana De Armas.

Other comments added to the post: 'Omg you look just like him. So adorable.'

Another said: 'I can see your cheeky face in him.'  

Look alike?  Jen recently shared this adorable childhood photo of herself

Look alike?  Jen recently shared this adorable childhood photo of herself

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Jennifer Garner posts Father's Day tribute to her dad Billy Jack... as fans call them twins

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