Jessica Biel says her son Silas is a "mini version" of her husband Justin Timberlake.

Justin Timberlake and Jessica Biel

Justin Timberlake and Jessica Biel

The 34-year-old actress and 'Suit & Tie' hitmaker celebrated their little boy's first birthday last week and the brunette beauty says it's like looking at the "same person" when she watches them enjoying golf on the television.

She said: "They're like the same person.

"It's like a mini version of him ... They like to sit and watch golf together. The only TV that Silas is allowed to watch is the Golf Channel, which is really funny.

"They just sit there on the couch staring at it. And they don't communicate anymore. When golf is on, all the communication ends."

The 'Total Recall' star had a low-key party to celebrate little Silas reaching the 12-month milestone with just family and she even made his cake herself.

She told PEOPLE magazine: "It was just a small family hang at the house."

Of what the sweet treat was made of, she added: "It was a lemon pound cake, almost. But it had zucchini in there."

Silas and Justin's similarities might have something to do with the fact Jessica used to play the 35-year-old R&B singer's music to her bump when she was expecting.

She previously revealed: "I listen to [Justin's] music probably more than I should. It's maybe slightly creepy. I love his music. Silas loves his music. I want him to hear it a lot. We listen to it in the car a lot.

"I went to probably 40-50 [of his] concerts when I was pregnant. I stood there and the music was just slamming. I actually thought, 'I'm going to damage this child!' "