When it comes to Hollywood couples, many high-profile duos dress to be noticed.

Theres Rihanna and A$AP Rockysmasterful streetwear, and Justin and Hailey Bieberspolar-opposite off-duty style.

Zoe Kravitz and Channing Tatum.

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Photo: Getty Images

Take the couples photo call appearance in London this weekend.

Styled by Andrew Mukamal, Kravitz and Tatum did all-black dressing in a sophisticated, not boring way.

Its not the only subtly-cool ensembles the couple have delivered on the red carpet.

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Photo: Getty Images

What makes their couple style so refreshing?

A commitment to dressing in sync yet going so understated that you have to squint to appreciate it.

So often, Hollywood couples wear outfits that clammer for your attention.

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Photo: Getty Images